J/MNRAS/385/1045 JHKsIc photometry of AGB in Phoenix dwarf gal. (Menzies+, 2008)
Asymptotic giant branch stars in the Phoenix dwarf galaxy.
Menzies J., Feast M., Whitelock P., Olivier E., Matsunaga N., Da Costa G.S.
<Mon. Not. R. Astron. Soc., 385, 1045-1052 (2008)>
=2008MNRAS.385.1045M 2008MNRAS.385.1045M
ADC_Keywords: Galaxies, nearby ; Stars, giant ; Photometry, infrared
Keywords: stars: AGB and post-AGB - stars: carbon - galaxies: dwarf -
galaxies: stellar content
Abstract:
JHKs near-infrared photometry of stars in the Phoenix dwarf galaxy is
presented and discussed. Combining these data with the optical
photometry of Massey et al. (2007, Cat. J/AJ/133/2393) allows a
rather clean separation of field stars from Phoenix members. The
discovery of a Mira variable (P=425d), which is almost certainly a
carbon star, leads to an estimate of the distance modulus of
23.10±0.18 that is consistent with other estimates and indicates the
existence of a significant population of age ∼2Gyr. The two carbon
stars of Da Costa have Mbol=-3.8 and are consistent with belonging to
a population of similar age; some other possible members of such a
population are identified. A Da Costa non-carbon star is
ΔKs∼0.3mag brighter than these two carbon stars. It may be an
asymptotic giant branch star of the dominant old population. The
nature of other stars lying close to it in the Ks, (J-Ks) diagram
needs studying.
Description:
Images centred on Phoenix were obtained over a period of about 3yr.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 50 95 Positions and infrared photometry for all single
stars measured on the images of Phoenix
obtained for this investigation
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See also:
J/AJ/133/2393 : UBVRI phot. in 7 Local Group dwarfs galaxies (Massey+, 2007)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 8 F8.5 deg RAdeg Right ascension in decimal degrees (J2000)
10- 18 F9.5 deg DEdeg Declination in decimal degrees (J2000)
20- 22 I3 --- [MFW2008] Sequential number
24- 28 F5.2 mag Ksmag Johnson Ks magnitude
30- 33 F4.2 mag J-H Johnson J-H colour index
35- 39 F5.2 mag H-Ks Johnson H-Ks colour index
41- 44 F4.2 mag J-Ks Johnson J-Ks colour index
46- 50 F5.2 mag Icmag ? Cousins I magnitude from Massey et al.
(2007, Cat. J/AJ/133/2393)
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 01-Aug-2008