FT-IR spectroscopy of CAI and chondrules in primitive chondrites: techniques and first results

From the Introduction: Here we present preliminary mid-infrared spectra of CAI, chondrules and matrix from the CV3.2 carbonaceous chondrite Allende. This is part of our ongoing project to compile a database of infrared and optical spectra of minerals and components of primitive meteorites. These spectra should allow a better comparison with spectra from astronomical sources e.g. from dust and molecular clouds or young solar systems

A Remarkable Oxygen-rich Asymptotic Giant Branch Variable in the Sagittarius Dwarf Irregular Galaxy

We report and discuss JHKs photometry for Sgr dIG, a very metal-deficient galaxy in the Local Group, obtained over 3.5 years with the Infrared Survey Facility in South Africa. Three large amplitude asymptotic giant branch variables are identified. One is an oxygen-rich star that has a pulsation period of 950 days, that was until recently undergoing hot bottom burning, with Mbol~-6.7. It is surprising to find a variable of this sort in Sgr dIG, given their rarity in other dwarf irregulars. Despite its long period the star is relatively blue and is fainter, at all wavelengths shorter than 4.5microns, than anticipated from period-luminosity relations that describe hot bottom burning stars. A comparison with models suggests it had a main sequence mass Mi~5 times solar and that it is now near the end of its AGB evolution. The other two periodic variables are carbon stars with periods of 670 and 503 days (Mbol~-5.7 and -5.3). They are very similar to other such stars found on the AGB of metal deficient Local Group Galaxies and a comparison with models suggests Mi~3 times solar. We compare the number of AGB variables in Sgr dIG to those in NGC6822 and IC1613, and suggest that the differences may be due to the high specific star formation rate and low metallicity of Sgr dIG.Comment: 12 pages, 10 figures, accepted for MNRA

On the generic status of "Nyctimystes rueppelli" (Anura: Hylidae), a tree frog of Halmahera Island, Indonesia

Published Online 05 October 2015Nyctimystes is currently diagnosed by a combination of two characters, namely vertical pupil and a palpebral venation. In a newly collected series of “Nyctimystes rueppelli” this combination of characters is found wanting and the species is therefore removed from Nyctimystes and transferred to Litoria. Removal of this species from Nyctimystes now allows that genus to have a third diagnostic character, unpigmented ova, and confines it to New Guinea and satellite islands.James I. Menzies, Awal Riyant

Mid-infrared spectroscopy of CAI and AOA from the Allende CV3.2 chondrite

Mid-infrared spectra of bulk CAI from the CV3.2 chondrite Allende are presented and compared with astronomical spectra of cometary dust, zodiacal light,the circumstellar disk of beta Pictoris and dust around the red supergiant PR Per

Transnational Networking and Business Success: Ethnic entrepreneurs in Canada

It is agreed that transnational networking plays an important role in the effectiveness of ethnic entrepreneurial firms. Yet, distinctions between the different types of transnational networking and their effects on business effectiveness have received scant attention in the literature, probably because ethnicity has been considered the main actor in the networkingeffectiveness relationship. This paper argues that one of the reasons business effectiveness differs across ethnic entrepreneurial firms is that ethnic entrepreneurs engage in dissimilar types of transnational networking. Analyses of the data generated by 720 ethnic entrepreneurs in Canada, revealed that ethnicity, human capital and push-pull factors play a central role in the engagement of different types of transitional networking; and the different types of transnational networking affect the business turnover (sales) and the business survival (age). Push-pull factors were found to play a marginal role in the business effectiveness. These results highlight the competitive market immigrants and members of ethnic minority groups encounter in the hosting economy and stress the value of transnational networking.Transnational Entrepreneurship, Networks, Immigrant Entrepreneurs, Ethnic Entrepreneur, Push and Pull Factors, Business Success, Business Outcomes

Period-Luminosity Relation for Type II Cepheids

We have estimated JHKs magnitudes corrected to mean intensity for LMC type II Cepheids found in the OGLE-III survey. Period-luminosity relations (PLRs) are derived in JHKs as well as in a reddening-free VI parameter. The BL Her stars (P<4d) and the W Vir stars (P=4 to 20d) are co-linear in these PLRs. The slopes of the infrared relations agree with those found previously for type II Cepheids in globular clusters within the uncertainties. Using the pulsation parallaxes of V553 Cen and SW Tau, the data lead to an LMC modulus of 18.46+-0.10 mag, uncorrected for any metallicity effects. We have now established the PLR of type II Cepheids as a distance indicator by confirming that (almost) the same PLR satisfies the distributions in the PL diagram of type II Cepheids in (at least) two different systems, i.e. the LMC and Galactic globular clusters, and by calibrating the zero point of the PLR. RV Tau stars in the LMC, as a group, are not co-linear with the shorter-period type II Cepheids in the infrared PLRs in marked contrast to such stars in globular clusters. We note differences in period distribution and infrared colors for RV Tau stars in the LMC, globular clusters and Galactic field. We also compare the PLR of type II Cepheids with that of classical Cepheids.Comment: To appear in the proceedings for the conference "Stellar Pulsation: Challenges for Theory and Observations" held in Santa Fe, US