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J/A+A/427/613  V,i,TiOr,CN photometry of And-II AGB stars    (Kerschbaum+, 2004)

A census of AGB stars in Local Group galaxies. III. The dwarf spheroidal And II. Kerschbaum F., Nowotny W., Olofsson H., Schwarz H.E. <Astron. Astrophys., 427, 613-619 (2004)> =2004A&A...427..613K (
ADC_Keywords: Stars, giant ; Photometry ; Stars, late-type Keywords: stars: AGB and post-AGB - stars: carbon - galaxies: local Group - galaxies: individual: And II - techniques: photometric - surveys Abstract: Our photometric survey of Local Group galaxies, using a four filter technique based on the method of Wing (1971, Proc. Conf. Late-Type Stars, ed. G.W. Lockwood and H.M. Dyck, KPNO Contribution 554, 145) allows the identification and subsequent characterization of their late-type stellar content. Two narrow band filters centred on molecular bands of TiO and CN allow us to distinguish between AGB stars of different chemistries [M-type (O-rich) and C-type (C-rich)]. The faint dwarf spheroidal galaxy And II, a member of the M 31 subgroup, was surveyed. From photometry in V and i as well as in the narrow band filters TiO and CN we were able to identify 7 new AGB carbon stars, to derive their mean absolute <Mi> and bolometric magnitude Mbol, their luminosity function, and their spatial distribution. We are unable to establish the true C/M ratio because the few M stars of And II are overwhelmed by foreground Galactic M st Description: Our observations were obtained with the 2.56 m Nordic Optical Telescopeat La Palma (Spain) during the nights of September 1 and 2, 2000. We observed the field in the four filters described in Table 2. Objects: ------------------------------------------ RA (2000) DE Designation(s) ------------------------------------------ 01 16 29.8 +33 25 54 And II ------------------------------------------ File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file tablea1.dat 61 2307 And II results
See also: J/AJ/127/318 : BV photometry of Andromeda II variables (Pritzl+, 2004) Table 2: Observing log. -------------------------------------------------------------------------------- Filter NOT# lambdac δλ System Exposure Time (Å) (Å) (s) -------------------------------------------------------------------------------- V 75 5300 800 Bessell 3x1200 i 12 7970 1570 Gunn 2x600 TiO 7780 110 Wing 6x1200 CN 8113 85 Wing 6x1200 Byte-by-byte Description of file: tablea1.dat
Bytes Format Units Label Explanations
1- 5 A5 --- Seq Sequential number 7- 10 I4 pix Xpos X position 12- 15 I4 pix Ypos Y position 17- 18 I2 h RAh Right ascension (J2000.0) 20- 21 I2 min RAm Right ascension (J2000.0) 23- 28 F6.3 s RAs Right ascension (J2000.0) 30 A1 --- DE- Declination sign (J2000.0) 31- 32 I2 deg DEd Declination (J2000.0) 34- 35 I2 arcmin DEm Declination (J2000.0) 37- 41 F5.2 arcsec DEs Declination (J2000.0) 43 A1 --- Flag [coru] Special flag which denotes in which region of Fig. 3 the star falls (1) 45- 49 F5.2 mag imag Gunn i magnitude 51- 55 F5.2 mag V-i V-i colour index (see "Table 2" section above) 57- 61 F5.2 mag TiO-CN ? TiO-CN index (see "Table 2" section above)
Note (1): Region of Fig. 3 in which the star falls: c for carbon stars, o for oxygen-rich stars, r for the rest, u for unclassified
Acknowledgements: Franz Kerschbaum, kerschbaum(at)astro.univie.ac.at
(End) Patricia Vannier [CDS] 19-Nov-2004
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