Coasts, tourism development regions

Las costas se han convertido en espacios predilectos para la realización de actividades turísticas, y esto ha provocado modificaciones en el medio natural generando afectaciones insostenibles en espacios marítimos y terrestres en los destinos, para satisfacer a una demanda creciente de visitantes, que cada vez requieren nuevos satisfactores, por lo que las actividades deben ser reguladas para su uso adecuado. Esta dinámica ha generado un incremento de nuevos pobladores atraídos por los beneficios laborales o por segunda residencia, un nuevo tipo de turísmo que hace de los lugares de playa su “casa” temporalmente. Las poblaciones locales reciben los beneficios de la actividad turística como empleo, la ampliación de servicios públicos y la generación de riqueza, pero también los efectos negativos como el deterioro ambiental general, la pérdida de identidad, cultura y tradiciones, además de sus espacios sociales, que deben compartirse con los turistas. Por ello, las comunidades locales buscan la preservación cultural de sus fiestas populares, entre otros. Presentamos en este volumen, trabajos que analizan la configuación del turismo en espacios costeros, cómo se construyen a partir de las iniciativas públicas, privadas y cooperativas. También acerca de la construcción de su identidad turística a partir de las imágenes representativas, el papel de la ciencia y de la planeación sostenible basada en la percepción de los turistas y los habitantes locales sobre las capacidades económicas y socioculturales. Estos permiten hacer una aproximación a la realidad de las zonas costeras a partir del turismo, los retos a los que se enfrentan en la planificación y operación, las condiciones de vida de las poblaciones locales y del medio ambiente natural, pero también las oportunidades que ofrece el turismo para el desarrollo y bienestar de la población cuando se realizan procesos sustentables.The coasts have become favorite spaces for tourist activities, this has caused modifications in the natural environment generating unsustainable damages in maritime and terrestrial spaces in the destinations, to satisfy an increasing demand of visitors, who increasingly require new satisfiers. Therefore, the activities must be regulated for their proper use. This dynamic has generated an increase in new residents attracted by employment benefits or by second residence, a new type of tourism that makes beach places their “home” temporarily. Local people receive unfair benefits of tourism such as employment, expanding public services, and the generation of wealth, but also the negative effects as general environmental degradation, loss of identity and traditions, as well as their social spaces, which must be shared with tourists. For this reason, local communities seek the cultural preservation of their popular festivals, among others. We present in this volume, work that analyze the configuration of tourism in coastal spaces, how the public, private and cooperative initiatives are built. Also, about the construction of their tourist identity from representative images, the role of science and sustainable planning based on tourists and local inhabitants’ perception of economic and socio-cultural capacities. These allow an approximation to the reality of coastal areas based on tourism, the challenges they face in planning and operation, the living conditions of local populations and the natural environment, but also the opportunities it offers for the development and well-being of the local population when sustainable processes are carried out

Early Science with the Large Millimetre Telescope: Molecules in the Extreme Outflow of a proto-Planetary Nebula

Extremely high velocity emission likely related to jets is known to occur in some proto-Planetary Nebulae. However, the molecular complexity of this kinematic component is largely unknown. We observed the known extreme outflow from the proto-Planetary Nebula IRAS 16342-3814, a prototype water fountain, in the full frequency range from 73 to 111 GHz with the RSR receiver on the Large Millimetre Telescope. We detected the molecules SiO, HCN, SO, and $^{13}$CO. All molecular transitions, with the exception of the latter are detected for the first time in this source, and all present emission with velocities up to a few hundred km s$^{-1}$. IRAS 16342-3814 is therefore the only source of this kind presenting extreme outflow activity simultaneously in all these molecules, with SO and SiO emission showing the highest velocities found of these species in proto-Planetary Nebulae. To be confirmed is a tentative weak SO component with a FWHM $\sim$ 700 km s$^{-1}$. The extreme outflow gas consists of dense gas (n$_{\rm H_2} >$ 10$^{4.8}$--10$^{5.7}$ cm$^{-3}$), with a mass larger than $\sim$ 0.02--0.15 M$_{\odot}$. The relatively high abundances of SiO and SO may be an indication of an oxygen-rich extreme high velocity gas.Comment: Accepted for publication in Monthly Notices of the Royal Astronomical Society Letter

The perception of the local population with respect to the impacts of tourism in the Pueblo Mágico of Tapalpa, Jalisco, Mexico

La actividad turística ha sido y es el motor de crecimiento de algunos municipios de México, en particular los denominados Pueblos Mágicos. Este es uno de los programas de turismo más exitosos. En este trabajo se efectuó un análisis sobre la percepción de la población local y los turistas acerca de los impactos que el turismo ha generado a partir de la denominación de Tapalpa como Pueblo Mágico. Para medir el impacto sobre la población local se realizó una encuesta a la población. La encuesta se dividió en seis segmentos para medir impactos positivos y negativos. Para el análisis se obtuvo la media aritmética de las respuestas a cada pregunta con el fin de analizar el grado de percepción global que la población y los turistas tienen sobre los impactos del turismo. El análisis de comparación de medias demuestra que los pobladores no diferencian entre los impactos positivos y negativos, ya que en ambos casos las medias están por encima de tres lo que significa que para ellos los impactos se dan indistintamente tanto para beneficiar a la población como para perjudicarla.Tourism has been and is the driving force behind development in many municipalities in Mexico, particularly in the network of so‑called “Magic Towns” or Pueblos Mágicos. This is one of the most successful tourism programmes. This paper presents an analysis of the perception of the local population with respect to the impact of tourism on Tapalpa after its designation as “Pueblo Mágico”. as reflected in a survey carried out on the general population. The survey was divided into six segments to measure both positive and negative impacts. The arithmetic mean value was calculated for each response to analyse the overall perception of the impact of tourism. The resulting mean comparison analysis shows that the residents do not differentiate between positive and negative impacts, since in all cases the mean is above three reflecting that the overall perception is both positive and negative., indicating that tourism is seen as a benefit and a danger at one and the same time

LMT/AzTEC observations of Vega

Vega is the prototypical debris disc system. Its architecture has been extensively studied at optical to millimetre wavelengths, revealing a near face-on, broad, and smooth disc with multiple distinct components. Recent millimetre-wavelength observations from ALMA spatially resolved the inner edge of the outer, cold planetesimal belt from the star for the first time. Here we present early science imaging observations of the Vega system with the AzTEC instrument on the 32-m LMT, tracing extended emission from the disc out to 150 au from the star. We compare the observations to three models of the planetesimal belt architecture to better determine the profile of the outer belt. A comparison of these potential architectures for the disc does not significantly differentiate between them with the modelling results being similar in many respects to the previous ALMA analysis, but differing in the slope of the outer region of the disc. The measured flux densities are consistent between the LMT (single dish) and ALMA (interferometric) observations after accounting for the differences in wavelength of observation. The LMT observations suggest the outer slope of the planetesimal belt is steeper than was suggested in the ALMA analysis. This would be consistent with the interferometric observations being mostly blind to structure at the disc outer edges, but the overall low signal to noise of the LMT observations does not definitively resolve the structure of the outer planetesimal belt.FK and JPM acknowledge research support by the Ministry of Science and Technology of Taiwan under grant MOST107-2119-M-001-031-MY3, and Academia Sinica under grant AS-IA-106-M03. JPM acknowledges research support by the Ministry of Science and Technology of Taiwan under grant MOST109-2112-M-001-036-MY3. MC thanks Consejo Nacional de Ciencia y Tecnología (CONACyT) for financial support through grant CB-2015-256961

The clumpy structure of ϵ\epsilon Eridani's debris disc revisited by ALMA

$\epsilon$ Eridani is the closest star to our Sun known to host a debris disc. Prior observations in the (sub-)millimetre regime have potentially detected clumpy structure in the disc and attributed this to interactions with an (as yet) undetected planet. However, the prior observations were unable to distinguish between structure in the disc and background confusion. Here we present the first ALMA image of the entire disc, which has a resolution of 1.6"$\times$1.2". We clearly detect the star, the main belt and two point sources. The resolution and sensitivity of this data allow us to clearly distinguish background galaxies (that show up as point sources) from the disc emission. We show that the two point sources are consistent with background galaxies. After taking account of these, we find that resolved residuals are still present in the main belt, including two clumps with a $>3\sigma$ significance -- one to the east of the star and the other to the northwest. We perform $n$-body simulations to demonstrate that a migrating planet can form structures similar to those observed by trapping planetesimals in resonances. We find that the observed features can be reproduced by a migrating planet trapping planetesimals in the 2:1 mean motion resonance and the symmetry of the most prominent clumps means that the planet should have a position angle of either ${\sim10^\circ}$ or ${\sim190^\circ}$. Observations over multiple epochs are necessary to test whether the observed features rotate around the star.Comment: 16 pages, 10 figures, accepted for publication in MNRA

Wandering near the red edge: photometric observations of three cool ZZ Ceti stars

We summarize our findings on three cool ZZ Ceti type pulsating white dwarfs. We determined eight independent modes in HS 0733+4119, of which seven are new findings. For GD 154, we detected two new eigenmodes, and the recurrence of the pulsational behaviour first observed in 1977. We discuss that GD 154 does not only vary its pulsations between a multiperiodic and a quasi-monoperiodic phase, but there are also differences between the relative amplitudes of the near-subharmonics observed in the latter phase. In the complex pulsator, Ross 808, we compared the pre- and post Whole Earth Telescope campaign measurements, and determined two new frequencies besides the ones observed during the campaign. Studying these stars can contribute to better understanding of pulsations close to the empirical ZZ Ceti red edge. All three targets are in that regime of the ZZ Ceti instability strip where short-term amplitude variations or even outbursts are likely to occur, which are not well-understood theoretically.Comment: 15 pages, 13 figures, accepted for publication in Monthly Notices of the Royal Astronomical Societ

The NIKA2 large-field-of-view millimetre continuum camera for the 30 m IRAM telescope

Context. Millimetre-wave continuum astronomy is today an indispensable tool for both general astrophysics studies (e.g. star formation, nearby galaxies) and cosmology (e.g. cosmic microwave background and high-redshift galaxies). General purpose, large-field-of-view instruments are needed to map the sky at intermediate angular scales not accessible by the high-resolution interferometers (e.g. ALMA in Chile, NOEMA in the French Alps) and by the coarse angular resolution space-borne or ground-based surveys (e.g. Planck, ACT, SPT). These instruments have to be installed at the focal plane of the largest single-dish telescopes, which are placed at high altitude on selected dry observing sites. In this context, we have constructed and deployed a three-thousand-pixel dual-band (150 GHz and 260 GHz, respectively 2 mm and 1.15 mm wavelengths) camera to image an instantaneous circular field-of-view of 6.5 arcmin in diameter, and configurable to map the linear polarisation at 260 GHz. Aims. First, we are providing a detailed description of this instrument, named NIKA2 (New IRAM KID Arrays 2), in particular focussing on the cryogenics, optics, focal plane arrays based on Kinetic Inductance Detectors, and the readout electronics. The focal planes and part of the optics are cooled down to the nominal 150 mK operating temperature by means of an adhoc dilution refrigerator. Secondly, we are presenting the performance measured on the sky during the commissioning runs that took place between October 2015 and April 2017 at the 30-m IRAM telescope at Pico Veleta, near Granada (Spain). Methods. We have targeted a number of astronomical sources. Starting from beam-maps on primary and secondary calibrators we have then gone to extended sources and faint objects. Both internal (electronic) and on-the-sky calibrations are applied. The general methods are described in the present paper. Results. NIKA2 has been successfully deployed and commissioned, performing in-line with expectations. In particular, NIKA2 exhibits full width at half maximum angular resolutions of around 11 and 17.5 arcsec at respectively 260 and 150 GHz. The noise equivalent flux densities are, at these two respective frequencies, 33±2 and 8±1 mJy s1/2. A first successful science verification run was achieved in April 2017. The instrument is currently offered to the astronomy community and will remain available for at least the following ten years

Repensando el turismo sustentable

El libro aborda la problemática del turismo sustentable que, por un lado, al compartir contornos nebulosos con la sustentabilidad, funciona como un nuevo circuito de acumulación fundamentado en un discurso retórico de desarrollo local; por el otro, se nos presenta como una alternativa potencial para la formulación de vías comunitarias de desarrollo local, que permitirían la prosperidad o al menos la sobrevivencia de culturas y territorios partucularizados.Universidad Autónoma del Estado de Méxic

Early science with the Large Millimetre Telescope: Deep LMT/AzTEC millimetre observations of ϵ Eridani and its surroundings

ϵ Eridani is a nearby, young Sun-like star that hosts a ring of cool debris analogous to the Solar system's Edgeworth-Kuiper belt. Early observations at (sub-)mm wavelengths gave tentative evidence of the presence of inhomogeneities in the ring, which have been ascribed to the effect of a putative low eccentricity planet, orbiting close to the ring. The existence of these structures has been recently challenged by high-resolution interferometric millimetre observations. Here, we present the deepest single-dish image of ϵ Eridani at millimetre wavelengths, obtained with the Large Millimetre Telescope Alfonso Serrano (LMT). The main goal of these LMT observations is to confirm (or refute) the presence of non-axisymmetric structure in the disc. The dusty ring is detected for the first time along its full projected elliptical shape. The radial extent of the ring is not spatially resolved and shows no evidence, to within the uncertainties, of dust density enhancements. Additional features of the 1.1 mm map are: (i) the presence of significant flux in the gap between the ring and the star, probably providing the first exo-solar evidence of Poynting-Robertson drag, (ii) an unambiguous detection of emission at the stellar positionwith a flux significantly above that expected from ϵ Eridani's photosphere, and (iii) the identification of numerous unresolved sources which could correspond to background dusty star-forming galaxies.This work would have not been possible without the long-term financial support from the Mexican Science and Technology Funding Agency, CONACyT (Consejo Nacional de Ciencia y Tecnología) during the construction and operational phase of the Large Millimetre Telescope Alfonso Serrano, as well as support from the US National Science Foundation via the University Radio Observatory program, the Instituto Nacional de Astrofísica, Optica y Electrónica (INAOE) and the University of Massachusetts, Amherst (UMass). MC, EB, FCSM, MO and RLV work was supported by CONACyT research grants SEP-2009-134985 and SEP-2011-169554. GMK is supported by the Royal Society as a Royal Society University Research Fellow. CE is partly supported by Spanish grant AYA2014-55840-P. JPM is supported by a UNSW Vice Chancellor's Postdoctoral Fellowship. SL acknowledges support from CONACyT through grant 238631