V1327 Aquilae: A New RR Lyrae variable with an extremely high radial velocity

Details V1327 Aquilae: A New RR Lyrae variable with an extremely high radial velocity V1327 Aquilae: A New RR Lyrae variable with an extremely high radial velocity

Jul 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008arep...52..539g&link_type=abstract

Astronomy Reports, Volume 52, Issue 7, pp.539-545

Astronomy and Astrophysics

Astronomy

97.30.Kn, 97.10.Ri, 97.10.Vm, 97.10.Wn, Rr Lyrae Stars, Rv Tauri And Pv Telescopii Variables, Luminosities, Magnitudes, Effective Temperatures, Colors, And Spectral Classification, Distances, Parallaxes, Proper Motions And Radial Velocities, Space Motions

Scientific paper

We have carried out photometry and spectroscopy of the star V1327 Aql ( R = 16 m ) as part of our program of observations of poorly studied cataclysmic variables using the 1.5-m optical Russian—Turkish telescope (RTT-150, Turkey) and the 6-m telescope of the Special Astrophysical Observatory of the Russian Academy of Sciences. After analyzing our photometry, we have re-classified the variable as an RR Lyrae star. Our BV R photometry during 10 nights reveals brightness variations with the period 12h49m, with the B, V, and R amplitudes being 1.36 m , 1.13 m , and 1.11 m , respectively. We derived the first estimates of the star’s atmospheric parameters from our moderate-resolution spectra: T eff = 6280 K, log g = 3.3, [M/H] = -1.05. The extremely high radial velocity of the star’s motion ( V R = -470 km/s) and the star’s large distances to the Galactic center (13.1 kpc) and disk (4.2 kpc) testify to a probable extragalactic origin of this object.

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