J/A+A/466/501 JKs photometry of WLM galaxy carbon stars (Valcheva+, 2007)
Carbon stars and C/M ratio in the WLM dwarf irregular galaxy.
Valcheva A.T., Ivanov V.D., Ovcharov E.P., Nedialkov P.L.
<Astron. Astrophys., 466, 501-507 (2007)>
=2007A&A...466..501V 2007A&A...466..501V
ADC_Keywords: Galaxies, nearby ; Stars, carbon ; Photometry, infrared
Keywords: galaxies: individual: WLM - stars: AGB and post-AGB - stars: carbon -
galaxies: irregular - Local Group
Abstract:
We identify the rich carbon star population of the Magellanic-type
dwarf irregular galaxy WLM (Wolf-Lundmark-Melotte) and study its
photometric properties from deep near-IR observations. The galaxy
also exhibits a clear presence of oxygen-rich population. We derive
a carbon to M-star ratio of C/M=0.56±0.12, relatively high in
comparison with many galaxies. The spatial distribution of the AGB
stars in WLM hints at the presence of two stellar complexes with a
size of a few hundred parsecs. Using the HI map of WLM and the
derived gas-to-dust ratio for this galaxy
N(HI)/E(B-V)=60±10[1021at/cm2/mag] we re-determined the
distance modulus of WLM from the IR photometry of four known Cepheids,
obtaining (m-M)0=24.84±0.14mag. In addition, we determine the scale
length of 0.75±0.14kpc of WLM disk in the J-band.
Description:
The observations of WLM were made in Dec. 2004 under non-photometric
conditions. To estimate the foreground contamination, an additional
field located 14.8' South from the center of the galaxy, far enough to
eliminate the galaxy contribution, was observed in July 2006
(hereafter "clear sky" field). The near-IR imaged and spectrograph
SofI (Son of ISAAC) at the ESO NTT (New Technology Telescope) on La
Silla was used.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 65 555 Photometry of 555 WLM stars with J- and Ks-band
photometry
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See also:
J/A+AS/113/539 : A survey of carbon stars in the SMC (Morgan+, 1995)
J/A+AS/122/463 : Carbon stars in Magellanic Clouds (Kunkel+ 1997)
J/A+AS/122/507 : Kinematics of SMC carbon stars (Hatzidimitriou+ 1997)
J/AJ/125/1298 : C star population in outer disk of M31 (Battinelli+, 2003)
J/MNRAS/376/313 : Carbon star in Magellanic Cloud (Groenewegen+, 2007)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- [VIO2007] Sequential number
5- 6 I2 h RAh Right ascension (J2000)
8- 9 I2 min RAm Right ascension (J2000)
11- 15 F5.2 s RAs Right ascension (J2000)
17 A1 --- DE- Declination sign (J2000)
18- 19 I2 deg DEd Declination (J2000)
21- 22 I2 arcmin DEm Declination (J2000)
24- 27 F4.1 arcsec DEs Declination (J2000)
29- 34 F6.3 mag Jmag J magnitude
36- 40 F5.3 mag e_Jmag rms uncertainty on Jmag
42- 47 F6.3 mag Ksmag Ks magnitude
49- 53 F5.3 mag e_Ksmag rms uncertainty on Ksmag
55- 65 A11 --- Note Notes (1)
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Note (1): Codes as follows:
M05 = Variable stars from Mora et al. (in preparation) A&A
SC85 = Variable stars from Sandage & Carlson (1985AJ.....90.1464S 1985AJ.....90.1464S)
C = Carbon stars from this work
BD04 = Carbon stars from Battinelli & Demers, 2004, Cat. J/A+A/416/111
G = Globular cluster
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Acknowledgements:
Antoniya Valcheva
(End) Antoniya Valcheva [IA, Bulgaria], Patricia Vannier [CDS] 12-Oct-2007