SIMBAD references

2007A&A...474...35B - Astronomy and Astrophysics, volume 474, 35-41 (2007/10-4)

The assessment of the near infrared identification of carbon stars. I. The Local Group galaxies WLM, IC 10 and NGC 6822.


Abstract (from CDS):

The selection of AGB C and M stars from NIR colours has been done in recent years using adjustable criteria that are in needs of standardization if one wants to compare, in a coherent manner, properties of various populations. We intend to assess the NIR colour technique to identify C and M stars. We compare the NIR colours of several C stars previously identified from spectroscopy or narrow band techniques in WLM, IC 10 and NGC 6822. We demonstrate that very few M stars have (J-K)0>1.4 but a non negligible number of C stars are bluer than this limit. Thus, counts of M and C stars based on such limit do not produce pure samples. C/M ratios determined from NIR colours must be regarded as underestimates mainly because the M numbers include many warm C stars and also K stars if no blue limit is considered.

Abstract Copyright:

Journal keyword(s): galaxies: individual: IC 10 - galaxies: individual: WLM - galaxies: individual: NGC 6822 - stars: carbon - stars: AGB and post-AGB - galaxies: dwarf

VizieR on-line data: <Available at CDS (J/A+A/474/35): table2.dat table3.dat>

CDS comments: Stars in WLM (table 2) are [BD2004a] NNN in Simbad, stars in IC 10 (table 3) [DBL2004] NNN.

Simbad objects: 123

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