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HD 123919


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Eleven New γ Doradus Stars
We present new high-dispersion spectroscopic and precise photometricobservations to identify 11 new γ Doradus variables. Seven ofthese new γ Doradus stars appear to be single, three are primariesof single-lined binaries, and one has two distant visual companions;none are double-lined or close visual binaries. Several of the starsshow spectroscopic line-profile and low-amplitude radial velocityvariability indicative of pulsation. All 11 stars are photometricallyvariable with amplitudes between 8 and 93 mmag in Johnson B and periodsbetween 0.398 and 2.454 days. One star is monoperiodic; the rest havebetween two and five independent periods. The variability at all periodsapproximates a sinusoid, although three of the stars exhibitcycle-to-cycle variation in the level of maximum brightness, similar tothe Blazhko effect observed in some RR Lyrae stars. We provide a newtabulation of all 54 γ Doradus stars confirmed to date and listsome of their properties. All are dwarfs or subgiants and lie within awell-defined region of the H-R diagram that overlaps the cool edge ofthe δ Scuti instability strip. Four of the new γ Doradusvariables from this paper also lie within the δ Scuti instabilitystrip but do not exhibit the additional higher frequency variabilitytypical of δ Scuti stars. The variability type of several of thesestars given in the General Catalog of Variable Stars and in SIMBADshould now be revised.

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Gözlemler ve gökölçümü verileri

Takýmyýldýz:Basakci
Sað Açýklýk:14h10m28.74s
Yükselim:-06°33'34.6"
Görünürdeki Parlaklýk:7.892
Uzaklýk:306.748 parsek
özdevim Sað Açýklýk:-20.1
özdevim Yükselim:-7.1
B-T magnitude:9.099
V-T magnitude:7.992

Kataloglar ve belirtme:
Özgün isimleri   (Edit)
HD 1989HD 123919
TYCHO-2 2000TYC 4982-228-1
USNO-A2.0USNO-A2 0825-08229119
HIPHIP 69236

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