J/MNRAS/330/137 VRc observations of LMC long-period red variables (Noda+, 2002)
Study of variable stars in the MOA data base: long-period red variables in the
Large Magellanic Cloud.
Noda S., Takeuti M., Abe F., Bond I.A., Dodd R.J., Hearnshaw J.B., Honda M.,
Honma M., Jugaku J., Kabe S., Kan-Ya Y., Kato Y., Kilmartin P.M.,
Matsubara Y., Masuda K., Muraki Y., Nakamura T., Nankivell G.R., Noguchi C.,
Ohnishi K., Reid M., Rattenbury N.J., Saito T., Sato H., Sekiguchi M.,
Skuljan J., Sullivan D.J., Sumi T., Watase Y., Wilkinson S., Yamada R.,
Yanagisawa T., Yock P.C.M., Yoshizawa M.
<Mon. Not. R. Astron. Soc. 330, 137 (2002)>
=2002MNRAS.330..137N 2002MNRAS.330..137N
ADC_Keywords: Magellanic Clouds ; Stars, variable ; Magnitudes
Keywords: catalogues - stars: AGB and post-AGB - stars: oscillations -
stars: variables: other - Magellanic Clouds
Abstract:
146 long-period red variable stars in the Large Magellanic Cloud (LMC)
from the three-year Microlensing Observations in Astrophysics (MOA)
project data base were analysed. A careful periodic analysis was
performed on these stars and a catalogue of their magnitudes, colours,
periods and amplitudes is presented. We convert our blue and red
magnitudes to K-band values using 19 oxygen-rich stars. A group of red
short-period stars separated from the Mira sequence has been found on
a (log P,K) diagram. They are located at the short period side of the
Mira sequence consistent with the work of Wood & Sebo
(1996MNRAS.282..958W 1996MNRAS.282..958W). There are two interpretations for such stars; a
difference in pulsation mode or a difference in chemical composition.
We investigated the properties of these stars together with their
colour, amplitude and periodicity. We conclude that they have small
amplitudes and less regular variability. They are likely to be
higher-mode pulsators. A large scatter has also been found on the
long-period side of the (logP,K) diagram. This is possibly a
systematic spread given that the blue band of our photometric system
covers both standard B and V bands and affects carbon-rich stars.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 89 147 146 selected long-period red variables
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See also:
J/AJ/99/784 : IR photometry of LMC long-period variables (Hughes+ 1990)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 12 A12 --- [NTA2002] MOA identification (nlmcN-NNNNNN)
14 I1 h RAh Right ascension (J2000.0)
16- 17 I2 min RAm Right ascension (J2000.0)
19- 23 F5.2 s RAs Right ascension (J2000.0)
25 A1 --- DE- Declination sign (J2000.0)
26- 27 I2 deg DEd Declination (J2000.0)
29- 30 I2 arcmin DEm Declination (J2000.0)
32- 36 F5.2 arcsec DEs Declination (J2000.0)
38- 42 F5.2 mag <Rcmag> Kron-Cousins R magnitude mean intensity
44- 48 F5.2 mag <Vmag> Johnson V magnitude mean intensity
50- 53 F4.2 mag e_<Rcmag> rms uncertainty on <Rcmag>
55- 58 F4.2 mag e_<Vmag> rms uncertainty on <Vmag>
60- 64 F5.1 d Per period
66- 69 F4.2 --- theta Phase Dispersion Minimization algorithm (PDM)
reliability parameter
71 A1 --- Id [a-g 1] Identification of the stars referred
to in the text
73- 86 A14 --- SHV Hughes & Wood (1990, Cat. J/AJ/99/784)
number
88- 89 A2 --- SpType MK Spectral type for stars from Hughes & Wood
(1990, Cat. J/AJ/99/784)
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History:
From electronic version of the journal
(End) James Marcout, Patricia Bauer [CDS] 28-Mar-2002