J/PASP/126/509 Double-mode RR Lyrae stars in LINEAR (Poleski+, 2014)
Double-mode radial pulsations among RR Lyrae stars.
Poleski R.
<Publ. Astron. Soc. Pac., 126, 509-520 (2014)>
=2014PASP..126..509P 2014PASP..126..509P
ADC_Keywords: Stars, variable
Keywords: Stars
Abstract:
Double-mode RR Lyr type stars are important for studies of properties
of horizontal-branch stars. In particular, two periods coupled with
spectral properties give a mass estimate that is independent of
evolutionary models. Here, we present 59 new Galactic double-mode RR
Lyr stars found in the LINEAR survey data with the fundamental radial
mode and the first overtone exited (RRd stars). These stars may be
useful for constraining the mass-metallicity relation for field
horizontal-branch stars. Also, new RRd stars found in the LMC by
EROS-II are verified. We present the updated Petersen diagram and the
distribution of the fundamental mode periods. Comments on selected
variable stars from LINEAR and LMC EROS-II surveys are also presented,
including very rare objects: the third known mode-switching RR Lyr and
a Cepheid pulsating simultaneously in three radial modes.
Description:
The LINEAR survey operated between 1998 and 2009 using two 1m
telescopes. Each of the mosaic cameras had a 2deg2 field of view
with a 2.25" pixel scale. Observations were collected without a filter
and sometimes in nonphotometric conditions.
On average, 250 epochs were collected per field, and the number rises
to 500 for targets close to the ecliptic plane. Such a dataset is
suitable for a search for periodic variable stars. The catalog of such
objects was presented by Palaversa et al. (2013AJ....146..101P 2013AJ....146..101P, Cat.
J/AJ/146/101). It includes more than 7000 stars, most of which are RR
Lyr pulsators. There are 2923 RRab and 990 RRc stars.
We performed the search for other radial modes in RR Lyr type stars.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 79 61 RRd pulsators found in LINEAR data
table2.dat 78 355 RRd pulsators confirmed using EROS-II LMC data
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See also:
J/AJ/146/101 : LINEAR. III. Catalog of periodic variables (Palaversa+, 2013)
J/A+A/566/A43 : EPOCH Project. EROS-2 LMC periodic variables (Kim+, 2014)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 8 I8 --- LINEAR [658512/24050838] Linear Identification number
10- 15 A6 --- Name Other (GCVS) name
17- 18 I2 h RAh Right ascension (J2000)
20- 21 I2 min RAm Right ascension (J2000)
23- 27 F5.2 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- 39 F4.1 arcsec DEs Declination (J2000)
41- 49 F9.7 d P1O [0.33/0.48] First overtone period
51- 59 F9.7 d e_P1O rms uncertainty on P1O
61- 69 F9.7 d PF [0.34/0.59] Fundamental period
71- 79 F9.7 d e_PF rms uncertainty on PF
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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 --- EROS-II EROS-II Designation
14 I1 h RAh Right ascension (J2000)
16- 17 I2 min RAm Right ascension (J2000)
19- 22 F4.1 s RAs Right ascension (J2000)
24 A1 --- DE- Declination sign (J2000)
25- 26 I2 deg DEd Declination (J2000)
28- 29 I2 arcmin DEm Declination (J2000)
31- 34 F4.1 arcsec DEs Declination (J2000)
36- 45 F10.8 d P1O [0.33/0.42] First overtone period
47- 56 F10.8 d e_P1O rms uncertainty on P1O
58- 67 F10.8 d PF [0.45/0.56] Fundamental mode period
69- 78 F10.8 d e_PF rms uncertainty on PF
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 06-Nov-2014