J/MNRAS/399/2063 LMC red giants in D sequence (Nicholls+, 2009)
Long secondary periods in variable red giants.
Nicholls C.P., Wood P.R., Cioni M.-R.L., Soszynski I.
<Mon. Not. R. Astron. Soc., 399, 2063-2078 (2009)>
=2009MNRAS.399.2063N 2009MNRAS.399.2063N
ADC_Keywords: Stars, giant ; Stars, variable ; Radial velocities
Keywords: stars: AGB and post-AGB - binaries: close - stars: oscillations
Abstract:
We present a study of a sample of Large Magellanic Cloud red giants
exhibiting Long Secondary Periods (LSPs). We use radial velocities
obtained from VLT spectral observations and MACHO and OGLE light
curves to examine properties of the stars and to evaluate models for
the cause of LSPs.
Description:
We chose a region of high star density in the middle of the LMC bar
for this study, in order to get a large sample of sequence D stars in
the 20-arcmin field of the FLAMES multifibre system on the VLT. The
field centre is at 05:28:15-69:45:43 (J2000). It contained a sample
of 58 variable red giants exhibiting LSPs which were obtained from the
MACHO Project data base.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
stars.dat 65 58 Stars list
table2.dat 100 30 Orbital elements
table1.dat 30 1160 Heliocentric radial velocities and Julian dates
for 58 MACHO Sequence D stars
fig/* . 22 EPS figures of light curves
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See also:
J/MNRAS/405/1770 : MACHO sequence E red giants (Nicholls+, 2010)
http://macho.anu.edu.au/ : MACHO Home Page
Byte-by-byte Description of file: stars.dat
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Bytes Format Units Label Explanations
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1- 12 A12 --- MACHO MACHO name
16- 17 I2 h RAh Right ascension (J2000)
19- 20 I2 min RAm Right ascension (J2000)
22- 27 F6.3 s RAs Right ascension (J2000)
29 A1 --- DE- Declination sign (J2000)
30- 31 I2 deg DEd Declination (J2000)
33- 34 I2 arcmin DEm Declination (J2000)
36- 40 F5.2 arcsec DEs Declination (J2000)
42- 65 A24 --- File Name of figure file, in "fig" subdirectory
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 12 A12 --- MACHO MACHO name
14- 20 F7.3 km/s gamma System velocity
22- 26 F5.3 km/s e_gamma rms uncertainty on gamma
28- 32 F5.3 km/s K Velocity semi-amplitude
34- 38 F5.3 km/s e_K rms uncertainty on K
40- 44 F5.3 --- e Eccentricity
46- 50 F5.3 --- e_e rms uncertainty on e
52- 57 F6.2 deg omega Angle of periastron ω
59- 63 F5.2 deg e_omega rms uncertainty on omega
65- 71 F7.2 d T0 Date of periastron (HJD-2450000)
73- 77 F5.2 d e_T0 rms uncertainty on T(HJD)
79- 85 F7.2 d Per ? Period
87- 91 F5.3 10-4Msun f(m) Mass function
93- 97 F5.3 10-4Msun e_f(m) rms uncertainty on f(m)
99-100 I2 --- Nobs Number of observations
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Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 12 A12 --- MACHO MACHO name
14- 23 F10.2 d HJD Heliocentric Julian Date
25- 30 F6.2 km/s HRV ?=- Heliocentric radial velocity
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 13-Dec-2010