Long Period Variables detected by ISO in the SMC

Abstract

This article presents the study of the light-curves extracted from the MACHO database of a sample of stars observed by the ISO in the SMC. These stars belong to the ISO-Mini-Survey catalogue of the Magellanic Clouds (ISO-MCMS, Loup et al. in preparation). Most of them are in the AGB and supergiant phases. The dominant period and amplitude of pulsation have been derived and the stars have been classified as Mira or Semi-Regular pulsators. Furthermore, the cross-identification with near-infrared DENIS and 2MASS magnitudes available within the ISO-MCMS allowed us: (i) to investigate the properties of these stars in the combined near- and mid-infrared colour-magnitude diagrams, (ii) to derive the bolometric magnitude by integrating the spectral energy distribution and (iii) to estimate the mass-loss rate. The stars have been divided into carbon- (C-) and oxygen-rich (O-rich) using the (J-Ks, Ks) colour-magnitude diagram and their period and amplitude distributions have been compared. C-rich AGB stars have a sharp peak in their period distribution at about 250 days and have on average a larger amplitude than O-rich AGB stars. This effect, not previously detected from the study of similar stars in the LMC and in the Baade's window, might be closely related to the metallicity of the environment in which the stars have formed.

arXiv comment14 pages, 10 figures, 5 tables (2 electronic), accepted for publication by A&A

References in corpus (15)

• The MACHO Project: Microlensing Results from 5.7 Years of LMC Observations
• N-body Simulations of the Small Magellanic Cloud and the Magellanic Stream
• The Origin of the Magellanic Stream
• Obscured Asymptotic Giant Branch Variables in the Large Magellanic Cloud and the Period-Luminosity Relation
• The DENIS Point Source Catalogue towards the Magellanic Clouds
• Towards the absolute planes: a new calibration of the Bolometric Corrections and Temperature scales for Population II Giants
• AGB stars in the Magellanic Clouds. I. The C/M ratio
• Variability and spectral classification of LMC giants: results from DENIS and EROS
• MSX, 2MASS, and the LMC: A Combined Near and Mid Infrared View
• Mass-Losing Semiregular Variable Stars in Baade's Windows
• Circumstellar masers in the Magellanic Clouds
• Multiperiodicity in semiregular variables II. Systematic amplitude variations
• Study of variable stars in the MOA data base: long-period red variables in the Large Magellanic Cloud
• AGAPEROS: Searching for variable stars in the LMC Bar II. Temporal and near-IR analysis of Long-Period Variables
• The Master Catalogue of stars towards the Magellanic Clouds

Cited by in corpus (47)

• Evolution of asymptotic giant branch stars I. Updated synthetic TP-AGB models and their basic calibration
• Hubble Space Telescope Observations of Mira Variables in the Type Ia Supernova Host NGC 1559: An Alternative Candle to Measure the Hubble Constant
• Spitzer SAGE survey of the Large Magellanic Cloud II: Evolved Stars and Infrared Color Magnitude Diagrams
• Luminosities and mass-loss rates of SMC and LMC AGB stars and Red Supergiants
• The distance to the giant elliptical galaxy NGC 5128
• AGB stars in the Magellanic Clouds. II. The rate of star formation across the LMC
• The metallicity gradient as a tracer of history and structure: the Magellanic Clouds and M33 galaxies
• A Spitzer mid-infrared spectral survey of mass-losing carbon stars in the Large Magellanic Cloud
• The X-shooter Spectral Library (XSL): I. DR1. Near-ultraviolet through optical spectra from the first year of the survey
• Molecules and dust production in the Magellanic Clouds
• Red variables in the OGLE-II database. I. Pulsations and period-luminosity relations below the tip of the Red Giant Branch of the LMC
• Spitzer Infrared Spectrograph Observations of Magellanic Cloud Planetary Nebulae: the nature of dust in low metallicity circumstellar ejecta
• New Optical and Near-Infrared Surface Brightness Fluctuations Models. II. Young and Intermediate Age Stellar Populations
• Mira Variables in the OGLE Bulge fields
• Spitzer spectroscopy of carbon stars in the Small Magellanic Cloud
• A Near-Infrared Period-Luminosity Relation for Miras in NGC 4258, an Anchor for a New Distance Ladder
• The X-Shooter Spectral Library (XSL): Data Release 2
• OGLE small amplitude red giant variables in the Galactic Bar
• Long Period Variables in the Magellanic Clouds: OGLE + 2MASS + DENIS
• Infrared Photometry and Evolution of Mass-Losing AGB Stars I. Carbon Stars Revisited
• 86 GHz SiO maser survey of late-type stars in the Inner Galaxy III. Interstellar extinction and colours of the SiO targets
• Spitzer Infrared Spectrographic point source classification in the Small Magellanic Cloud
• A Spitzer Space Telescope far-infrared spectral atlas of compact sources in the Magellanic Clouds. I. The Large Magellanic Cloud
• The M33 Variable Star Population Revealed by Spitzer
• Near-IR observations of NGC 6822: AGB stars, distance, metallicity and structure
• A Spitzer Space Telescope far-infrared spectral atlas of compact sources in the Magellanic Clouds. II. The Small Magellanic Cloud
• The nature of dust in compact Galactic planetary nebulae from Spitzer spectra
• A Spitzer Study of Asymptotic Giant Branch Stars. III. Dust Production and Gas Return in Local Group Dwarf Irregular Galaxies
• Red variables in the OGLE-II database. II. Comparison of the Large and Small Magellanic Clouds
• Joint Analysis of near-infrared properties and surface brightness fluctuations of LMC star clusters
• AGB stars as tracers of metallicity and mean age across M33
• Infrared Photometry and Evolution of Mass-Losing AGB Stars. II. Luminosity and Colors of MS and S Stars
• Carbon stars in the X-shooter Spectral Library
• The evolved stars of Leo II dSph galaxy from near-infrared UKIRT/WFCAM observations
• Carbon stars as standard candles: I. The luminosity function of carbon stars in the Magellanic Clouds
• Red variables in the OGLE-II data base -- III. Constraints on the three-dimensional structures of the LMC and SMC
• A Fresh Look at AGB stars in Galactic Open Clusters with Gaia: Impact on Stellar Models and the Initial-Final Mass Relation
• X-ray bright sources in the Chandra Small Magellanic Cloud Wing Survey - detection of two new pulsars
• Mid Infrared Photometry of Mass-Losing AGB Stars
• Late-type giant variables in NGC6522, LMC and SMC: How do they differ?
• Pulsation properties of C stars in the Small Magellanic Cloud
• XSL: The X-Shooter Spectral Library
• Light and colour variations of Mira variables in the Small Magellanic Cloud
• Examining the Infrared Variable Star Population Discovered in the Small Magellanic Cloud Using the SAGE-SMC Survey
• Oxygen- and carbon-rich variable red giant populations in the Magellanic Clouds from EROS, OGLE, MACHO, and 2MASS photometry
• Unveiling VVV/WISE Mira variables on the far side of the Galactic disk: Distances, kinematics and a new extinction law
• IR imaging surveys of AGB stars in the Magellanic Clouds