METAL ABUNDANCES, RADIAL VELOCITIES, AND OTHER PHYSICAL CHARACTERISTICS FOR THE RR LYRAE STARS IN THE KEPLER FIELD

Spectroscopic iron-to-hydrogen ratios, radial velocities, atmospheric parameters, and new photometric analyses are presented for 41 RR Lyrae stars (and one probable high-amplitude delta Sct star) located in the field-of-view of the Kepler space telescope. Thirty-seven of the RR Lyrae stars are funda...

Full description

Saved in:
Bibliographic Details
Published in:The Astrophysical journal 2013-08, Vol.773 (2), p.1-30
Main Authors: Nemec, James M, Cohen, Judith G, Ripepi, Vincenzo, Derekas, Aliz, Moskalik, Pawel, SESAR, BRANIMIR, CHADID, MERIEME, BRUNTT, HANS
Format: Article
Language:English
Subjects:
ABUNDANCE
ACCURACY
AMPLITUDES
ASTROPHYSICS, COSMOLOGY AND ASTRONOMY
FREQUENCY MODULATION
HYDROGEN
IRON
PHOTOMETRY
RADIAL VELOCITY
Space telescopes
Spectroscopic analysis
SPECTROSCOPY
STARS
TELESCOPES
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Spectroscopic iron-to-hydrogen ratios, radial velocities, atmospheric parameters, and new photometric analyses are presented for 41 RR Lyrae stars (and one probable high-amplitude delta Sct star) located in the field-of-view of the Kepler space telescope. Thirty-seven of the RR Lyrae stars are fundamental-mode pulsators (i.e., RRab stars) of which sixteen exhibit the Blazhko effect. Four of the stars are multiperiodic RRc pulsators oscillating primarily in the first-overtone mode. Spectroscopic [Fe/H] values for the 34 stars for which we were able to derive estimates range from -2.54 + or - 0.13 (NR Lyr) to -0.05 + or - 0.13 dex (V784 Cyg), and for the 19 Kepler-field non-Blazhko stars studied by Nemec et al. the abundances agree will with their photometric [Fe/H] values. Four non-Blazhko RR Lyrae stars that they identified as metal-rich (KIC 6100702, V2470 Cyg, V782 Cyg and V784 Cyg) are confirmed as such, and four additional stars (V839 Cyg, KIC 5520878, KIC 8832417, KIC 3868420) are also shown here to be metal-rich. Five of the non-Blazhko RRab stars are found to be more metal-rich than [Fe/H] ~-0.9 dex while all of the 16 Blazhko stars are more metal-poor than this value. New P-[phi]s sub(31)-[Fe/H] relationships are derived based on ~970 days of quasi-continuous high-precision Q0-Q11 long- and short-cadence Kepler photometry. With the exception of some Blazhko stars, the spectroscopic and photometric [Fe/H] values are in good agreement. Several stars with unique photometric characteristics are identified, including a Blazhko variable with the smallest known amplitude and frequency modulations (V838 Cyg).
ISSN:0004-637X
1538-4357
DOI:10.1088/0004-637X/773/2/181