J/A+AS/123/115 Variables stars in Palomar-Groningen field 3 (Ng+ 1997)
Field 3 of the Palomar-Groningen Survey.
I. Variable stars at the edge of the Sagittarius dwarf galaxy
Ng Y.K., Schultheis M.
<Astron. Astrophys. Suppl. Ser. 123, 115 (1997)>
=1997A&AS..123..115N 1997A&AS..123..115N (SIMBAD/NED BibCode)
ADC_Keywords: Stars, variable ; Magnitudes, photographic
Keywords: stars: carbon ; AGB, post-AGB; variables: others - Local Group -
galaxies: Sagittarius dwarf
Abstract:
A catalogue is presented with variable (RR Lyrae, semiregular and
Mira) stars located inside field #3 (PG3) of the Palomar-Groningen
Survey at the outer edge of the Sagittarius dwarf galaxy. One of the
semiregular variables is a carbon star, comparable with those found by
Azzopardi et al. (1991A&AS...88..265A 1991A&AS...88..265A). Serendipity provides the
suggestion, that their carbon stars might not be located inside, but
behind the bulge on the Sagittarius dwarf galaxy.
Objects:
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RA (2000) DE Designation(s)
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19 29 58.9 -17 40 40 Sagittarius dwarf galaxy
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1 77 22 Catalogue of PG3 variable stars
find_pg3.ps 1023 23098 Finding charts
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See also:
J/A+A/338/581 : Field 3 Palomar-Groningen survey. II. (Schultheis+ 1998)
Byte-by-byte Description of file: table1
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Bytes Format Units Label Explanations
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1- 4 I4 --- ID Star number (1)
6- 13 A8 --- VarType Variable type (2)
16- 17 I2 h RAh Right ascension (J2000)
19- 20 I2 min RAm Right ascension (J2000)
22- 25 F4.1 s RAs Right ascension (J2000)
27 A1 --- DE- Declination sign
28- 29 I2 deg DEd Declination (J2000)
31- 32 I2 arcmin DEm Declination (J2000)
34- 37 F4.1 arcsec DEs Declination (J2000)
40- 44 F5.1 deg GLON Galactic longitude
46- 50 F5.1 deg GLAT Galactic latitude
53- 57 F5.2 mag Bmag Mean photographic BJ magnitude (3)
59- 63 F5.2 mag Rmag Mean photographic RF magnitude (3)
66- 75 F10.6 d P ? Period
77 I1 --- Q [0/3] Quality flag (4)
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Note (1): Variable star number, following Plaut (1971A&AS....4...75P 1971A&AS....4...75P) and
Wesselink (1987)
Note (2): Variable star classification, where the semiregular classification
is taken from Plaut (1971A&AS....4...75P 1971A&AS....4...75P); if two classifications are
given, the first is from Wesselink (1987) and the second from
Plaut (1971A&AS....4...75P 1971A&AS....4...75P)
Note (3): The mean B_J and R_F photographic magnitudes for the RR Lyrae
and the Mira are from Wesselink (1987). The photographic photometry
of the semiregular variables is obtained in the study by Ng (1994)
Note (4): Quality flag (classification and period) of variable star
following Wesselink (1987);
Q=0: no doubt about the determined period and classification,
Q=1: classification is correct but alternative period is possible,
Q=2: period determination is correct but the classification is doubtful,
Q=3: both period determination and classification are unreliable
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Acknowledgements: Yuen Keong Ng
References:
Ng Y.K., 1994, Ph.D. thesis, Leiden University, the Netherlands
Plaut L., 1971, A&AS 4, 75
Wesselink Th.J.H., 1987, Ph.D. thesis, Catholic University Nijmegen,
the Netherlands
(End) Patricia Bauer [CDS] 13-Jan-1997