J/A+AS/126/401 M 31 Cepheids periods (Magnier+ 1997)
Cepheids as tracers of star formation in M 31.
I. Observations and identifications.
Magnier E.A., Augusteijn T., Prins S., van Paradijs J., Lewin W.H.G.
<Astron. Astrophys. Suppl. Ser. 126, 401 (1997)>
=1997A&AS..126..401M 1997A&AS..126..401M (SIMBAD/NED BibCode)
ADC_Keywords: Stars, variable ; Magnitudes
Keywords: (stars: variables:) Cepheids - stars: formation -
galaxies: individual: M 31 - galaxies: stellar content -
(cosmology:) distance scale
Abstract:
Cepheid variables can be used for more than just a distance indicator.
Since the age can be determined from the period, they can be used to
trace the star formation history of a galaxy. We have identified 130
new Cepheid variable candidates in M 31, particularly along the spiral
arm regions in the north-east of the galaxy. These areas had not been
searched for Cepheids in the previous study by Baade and
collaborators. The contamination of our sample by other types of
variables is low (<3%). For V<21, the completeness is ≃53%. These
Cepheids will be used to explore the star formation history in M 31.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1 46 130 New M31 Cepheid Candidate Identifications
figure5.ps 61 10727 *Light curves of New Cepheid Candidates
figure6.ps 61 11224 Light curves of New Cepheid Candidates
figure7.ps 61 10948 Light curves of New Cepheid Candidates
figure8.ps 61 12624 Light curves of New Cepheid Candidates
figure9.ps 61 11926 Light curves of New Cepheid Candidates
figure10.ps 61 5631 Light curves of New Cepheid Candidates
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Note to figure5.ps: All 6 figures show the V lightcurves of the candidate
Cepheids. A pair of dashed lines show the 1 sigma range of V (max).
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Byte-by-byte Description of file: table1
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Bytes Format Units Label Explanations
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1- 3 I3 --- ID Identification number
5- 11 F7.4 deg RAdeg Right ascension (J2000)
13- 19 F7.4 deg DEdeg Declination (J2000)
21- 25 F5.2 mag Vmag Maximum V magnitude
27- 30 F4.2 mag e_Vmag rms uncertainty on Vmag
32- 35 F4.1 d Per Period
37- 40 F4.1 d e_Per rms uncertainty on Per
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Acknowledgements: Eugene Magnier
(End) Patricia Bauer [CDS] 15-Sep-1997