9 research outputs found

    Carbon-Rich Mira Variables: Radial Velocities and Distances

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    Optical radial velocities have been measured for 38 C-type Mira variables. These data together with others in the literature are used to study the differences between optical and CO mm observations for C-Miras and the necessary corrections to the optical velocities are derived in order to obtain the true radial velocities of the variables. The difference between absorption and emission line velocities is also examined. A particularly large difference (+30 km\s) is found in the case of the H-alpha emission line. A catalogue is given of 177 C-Miras with estimated distances and radial velocities. The distances are based on bolometric magnitudes derived in Paper I using SAAO observations or (for 60 of the stars) using non-SAAO photometry. In the latter case the necessary transformations to the SAAO system are derived. These data will be used in paper III to study the kinematics of the C-Miras.Comment: 11 pages, accepted for publication in MNRA

    Detecting Variability in Massive Astronomical Time-Series Data I: application of an infinite Gaussian mixture model

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    We present a new framework to detect various types of variable objects within massive astronomical time-series data. Assuming that the dominant population of objects is non-variable, we find outliers from this population by using a non-parametric Bayesian clustering algorithm based on an infinite GaussianMixtureModel (GMM) and the Dirichlet Process. The algorithm extracts information from a given dataset, which is described by six variability indices. The GMM uses those variability indices to recover clusters that are described by six-dimensional multivariate Gaussian distributions, allowing our approach to consider the sampling pattern of time-series data, systematic biases, the number of data points for each light curve, and photometric quality. Using the Northern Sky Variability Survey data, we test our approach and prove that the infinite GMM is useful at detecting variable objects, while providing statistical inference estimation that suppresses false detection. The proposed approach will be effective in the exploration of future surveys such as GAIA, Pan-Starrs, and LSST, which will produce massive time-series data.Comment: accepted for publication in MNRA

    Infrared Properties of Cataclysmic Variables from 2MASS: Results from the 2nd Incremental Data Release

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    Because accretion-generated luminosity dominates the radiated energy of most cataclysmic variables, they have been ``traditionally'' observed primarily at short wavelengths. Infrared observations of cataclysmic variables contribute to the understanding of key system components that are expected to radiate at these wavelengths, such as the cool outer disk, accretion stream, and secondary star. We have compiled the J, H, and Ks photometry of all cataclysmic variables located in the sky coverage of the 2 Micron All Sky Survey (2MASS) 2nd Incremental Data Release. This data comprises 251 systems with reliably identified near-IR counterparts and S/N > 10 photometry in one or more of the three near-IR bands.Comment: 2 pages, including 1 figure. To appear in the proceedings of The Physics of Cataclysmic Variables and Related Objects, Goettingen, Germany. For our followup ApJ paper (in press), also see http://www.ctio.noao.edu/~hoard/research/2mass/index.htm

    Music as a nursing intervention for patients who live with dementia.

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    Syftet med denna litteraturstudie var att undersöka hur musik som omvÄrdnadsÄtgÀrd pÄverkar vÀlbefinnandet och symtombilden hos personer som lever med demenssjukdom. I Sverige finns det ca 140 000 mÀnniskor med demenssjukdom och 65 000 av dessa bodde i sÀrskilda boendeformer. De vanligaste demenssjukdomarna Àr Alzheimers sjukdom, frontallobsdemens, vaskulÀr demens samt sekundÀr demens som kan orsakas av infektioner. Att leva med sjukdomen demens innebÀr i de flesta fall att ens funktionella kapacitet försÀmras successivt. Uppsatsen genomfördes som en litteraturstudie inom Àmnet omvÄrdnad och baserades pÄ 12 vetenskapliga artiklar, med bÄde kvantitativ och kvalitativ ansats, som har publicerats under de senaste 14 Ären. GenomgÄende i resultatet framkom det att musik som omvÄrdnadsÄtgÀrd kan ge positiv effekt pÄ symtombilden och vÀlbefinnandet. Musiken kan exempelvis lindra oro, agitation, förbÀttra den kognitiva förmÄgan samt stimulera minnet och ge en ökad kÀnsla av vÀlbefinnande. Olika sorters musik pÄverkar mÀnniskor pÄ olika sÀtt, till exempel ger levande musik det största vÀlbefinnandet enligt uppsatsens resultat. Genom att anvÀnda musik som en omvÄrdnadsÄtgÀrd kan sjuksköterskan skapa en harmonisk, stimulerande och trivsammare miljö för bÄde patienter och personal. I diskussionen betonades att musik som ÄtgÀrd, vid bland annat oro och agitation, borde övervÀgas som ett komplement till lÀkemedel med lugnande effekt dÄ musik har visats sig ge mÄnga positiva effekter pÄ dessa symtom

    Internationaliseringen av den svenska Försvarsmakten sett ur ett policyperspektiv med fokus pÄ Ären 1992-2001 : jÀmvikt eller förÀndring?

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    Uppsatsen analyserar om perioden 1992-2001 kĂ€nnetecknades av jĂ€mvikt eller förĂ€ndring avseende Sverigesinternationella engagemang. Syftet med uppsatsen Ă€r att belysa hur den svenska instĂ€llningen till den internationellatjĂ€nsten har utvecklats under perioden 1992-2001.Problemformulering:- Vad kĂ€nnetecknade perioden 1992-2001 avseende Sveriges internationella engagemang.Som ett led till att finna svar pĂ„ problemformuleringen kommer jag att anvĂ€nda mig av följande delfrĂ„gor:- Vilken var Sveriges stĂ„ndpunkt till internationell verksamhet under de tre försvarsbeslutsperioderna 1992-2001?- Vilka avvikelser och likheter mellan perioder kan pĂ„visas?- Vilka större förĂ€ndringar har skett frĂ„n Försvarsbeslutet 1992 till regleringsbrevet 2001?Författaren kommer att jĂ€mföra den svenska sĂ€kerhetspolitiska instĂ€llningen vid tiden för tre olika Försvarsbeslut1992, 1996 och 2000 och tillsammans med regleringsbreven frĂ„n 1994, 1997 och 2001 komma fram till dels vilkenstĂ„ndpunkt Sverige intog under respektive period och dels vilka likheter och olikheter som finns.Uppsatsens svar pĂ„ problemstĂ€llningen och de viktigaste sluts atserna Ă€r att:Det har funnits överensstĂ€mmelse mellan policydokumenten inom och mellan perioderna. Det finns en tydlig tendenstill utvidgning av Sveriges sĂ€kerhetspolitiska intresse, frĂ„n norra Europa, till internationellt och till globalt. Underperioden skjuts ocksĂ„ fokus frĂ„n Mellanöstern och mellanstatliga konflikter till Europa och inomstatliga konflikter.Det sĂ€kerhetspolitiska hotet utökades frĂ„n att enbart varit militĂ€rt till att Ă€ven gĂ€lla global demokrati och hot mot vĂ„rtsamhĂ€lles funktioner. Det har under hela perioden skett en utökning av Sveriges ambitionsnivĂ„, denna har dock intealltid effektualiserats. Det har under perioden skett en förskjutning frĂ„n nationell nivĂ„ till en acceptans av ett meröverstatligt inflytande.Det finns en tydlig tendens till ökande ambitioner vad avser Försvarsmaktens internationella förmĂ„ga, frĂ„nfredsbevarande i FN: s regi till fredsframtvingande operationer tillsammans med andra lĂ€nder. Även om det underperioden skett förĂ€ndringar sĂ„ har dessa hela tiden gĂ„tt i riktning mot ökad internationalisering och det har inte funnitsnĂ„gra accentuerade policysvĂ€ngningar inom den undersökta perioden. Detta talar för att perioden har kĂ€nnetecknats avett ”jĂ€mviktsförhĂ„llande”.The essay will analyse if the period 1992-2001 is characterised by equilibrium or changesbecause of Swedish international involvement. The purpose of the essay is to highlight how theSwedish political attitude has developed during the year 1992-2001.Questions:- What characterised the period 1992-2001 and how did this affect Swedish internationalcommitment?As a way of answering this, it is separated into the following parts:- What point of view did Sweden take during the three defence periods?- What similarities and differences can be shown?- What major changes have occurred between the defence period 1992 and the Letter ofRegulation 2001?The author will compare the Swedish view of security defence policy at the time of threedifferent defence periods 1992, 1996 and 2000, together with the Letter of Regulation from1994, 1997 and 2001. This is done in order to clarify what point of view the Swedishgovernment claimed to have during these periods and what similarities and differences therewere to be found.The result of the questions and the most significant conclusions are as follows:There has been agreement between the policy documents within and between periods. Therehas been a significant tendency to enlarge Sweden’s security interest area from the north ofEurope to the whole of Europe and globally. During the mentioned periods, focus is movedfrom the Middle East and conflicts between states towards Europe and conflicts within states.The security political threat has enlarged from being just a military one to encompassing evenglobal democracy and becoming a threat to our society’s functions. During the entire periodthere has been an enlargement of Sweden’s level of ambition, though it has not always beenfulfilled. During the named period a displacement from national level towards moresupranational influence has occurred.There is a significant tendency towards growing ambitions regarding the Swedish Defenceinternational capacity, from peacekeeping in the name of UN towards peace enforcementoperations together with other countries. Even if changes occurred during the mentionedperiods, these changes have followed the same direction towards increasing internalisation andthere have not been any accentuated policy changes during this era. This is strong evidence thatthe period was characterised by a state of equilibrium.Avdelning: ALB - Slutet Mag 3 C-upps.Hylla: Upps. ChP 00-0
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