Carbon star survey in the Local Group

Demers, S.; Battinelli, P.; Letarte, B.

doi:10.1051/0004-6361:20031286

Cited by 30 publications

(27 citation statements)

References 29 publications

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“…The brightest sources with −8.4 < M bol < −6.0 mag tend to be in the central area, although they are too few in number to draw a definite conclusion. Demers et al (2003) found that the carbon stars are located almost exclusively in and near the disk for the Magellanic type galaxy NGC 3109. This is consistent with our results in the SMC and the LMC.…”

Section: The Small Magellanic Cloudmentioning

confidence: 99%

Luminous AGB stars in nearby galaxies

Tsalmantza¹,

Kontizas

Cambrésy

et al. 2006

A&A

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Aims. This study focuses on very luminous (M bol < −6.0 mag) AGB stars with J − K s > 1.5 mag and H − K s > 0.4 mag in the LMC, SMC, M 31, and M 33 from 2MASS data. Methods. The data were taken from the 2MASS All-Sky Point Source catalogue archive. We used Virtual Observatory tools and took advantage of its capabilities at various stages in the analysis. Results. It is well known that stars with the colors we selected correspond mainly to carbon stars. Although the most luminous AGBs detected here contain a large number of carbon stars, they are not included in existing catalogues produced from data in the optical domain, where they are not visible since they are dust-enshrouded. A comparison of the AGB stars detected with combined near and mid-infrared data from MSX and 2MASS in the LMC shows that 10% of the bright AGB stars are bright carbon stars never detected before and that the other 50% are OH/IR oxygen rich stars, whereas the 40% that remain were not cross-matched. Conclusions. The catalogues of the most luminous AGB stars compiled here are an important complement to existing data. In the LMC, these bright AGB stars are centrally located, whereas they are concentrated in an active star-formation ring in M 31. In the SMC and M 33, there are not enough of them to draw definite conclusions, although they tend to be centrally located. Their luminosity functions are similar for the four galaxies we studied.

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Section: The Small Magellanic Cloudmentioning

confidence: 99%

Luminous AGB stars in nearby galaxies

Tsalmantza¹,

Kontizas

Cambrésy

et al. 2006

A&A

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“…Because of its proximity to us it turns out to be one of the brightest galaxies seen in the southern sky. Its carbon star population has been surveyed by Demers et al (2003) who identified over 400 C stars using the narrow band technique. Recently the near-infrared J and K s magnitudes of 77 Cepheids have been used by Soszyński et al (2006) to accurately determine the distance of NGC 3109.…”

Section: The Target Galaxiesmentioning

confidence: 99%

“…The small size of the images makes the astrometric and magnitude calibrations more difficult than for the SOFI data. For the astrometry we use as a reference the C star coordinates published by Demers et al (2003) and seen in the field. Because of the lack of suitable 2MASS stars, the magnitude calibration is done using the published J and K s magnitudes of the Cepheids (Soszyński et al 2006), taken on the same night as the images we analyse.…”

Section: Ngc 3109mentioning

confidence: 99%

Assessment of the near infrared identification of carbon stars

Battinelli¹,

Demers²

2008

A&A

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Context. Thousands of C stars have been identified in Local Group galaxies using narrow band photometry. To survey C stars at larger distances and alternative to the narrow-band approach is needed. Aims. We obtain, from ESO Archive data, NIR magnitudes and colours of previously known C stars in two dwarf irregular Local Group galaxies, namely IC 1613 and NGC 3109. Methods. We compare the NIR magnitudes and colours of the C star populations, previously identified from narrow band techniques to estimate the star formation history of their intermediate-age populations. Results. We demonstrate that the photometric properties of C stars show a wider range in the NIR than in the optical. As confirmed by models we see, among the four galaxies investigated with a 0.7 dex metallicity range, little if any metallicity effect in the C star colour distribution.

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“…Historically, these stars have attracted the attention of observers for several reasons: their characteristic observability due to the CN and C 2 bands in their spectra, their rarity (∼100 are presently known), and their high luminosity as AGB stars, which make them useful for studying the stellar content of the galactic halo at large distances (see for example Wallerstein & Knapp 1998;Totten & Irwin 1998, hereafter TI98). For illustration, in the I-band, Demers et al (2003) found from the study of several Local Group galaxies that the average I-band absolute magnitude of (not too dusty) AGB C stars is M I = −4.6. This average luminosity leads one to expect an apparent magnitude as bright as I = 15.4 for a distance of 100 kpc.…”

Section: Introductionmentioning

confidence: 99%

Cool carbon stars in the halo

Mauron

Kendall

Gigoyan

2005

A&A

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Abstract. We present new results from an ongoing survey of carbon-rich asymptotic giant (AGB) stars in the halo of our Galaxy. After selecting candidates primarily through their 2MASS colours, slit spectroscopy was achieved at the ESO NTT telescope. Twenty-one new AGB carbon stars were discovered, increasing the total of presently known similar AGB C stars to ∼120. A further four were observed again in order to confirm their carbon-rich nature and measure radial velocities. Two main findings emerge from this work. First, we found a C star located at ≈130 kpc from the Sun and at b = −62• . This distant star is remarkably close (5 kpc) to the principal plane of the Stream of the Sagittarius dwarf galaxy, and is likely to be a tracer of a distant poorly populated southern warp of the Stream. Such a warp is predicted by model simulations, but it passes ∼45 kpc from that star. The second result is that, mainly in the North, several already known or newly discovered AGB carbon stars lie far, up to 60 kpc, from the mean plane of the Sagittarius Stream.

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Carbon star survey in the Local Group

Cited by 30 publications

References 29 publications

Luminous AGB stars in nearby galaxies

Luminous AGB stars in nearby galaxies

Assessment of the near infrared identification of carbon stars

Cool carbon stars in the halo

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