A photometric and spectrographic study of XX Cygni

Details A photometric and spectrographic study of XX Cygni A photometric and spectrographic study of XX Cygni

Apr 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980pasp...92..195m&link_type=abstract

Astronomical Society of the Pacific, Publications, vol. 92, Apr.-May 1980, p. 195-201. NSF-supported research.

Astronomy and Astrophysics

Astronomy

14

Spectrum Analysis, Stellar Spectrophotometry, Ubv Spectra, Variable Stars, Abundance, Interstellar Extinction, Radial Velocity, Reflecting Telescopes, Sky Brightness, Spectrographs, Stellar Gravitation, Stellar Luminosity, Stellar Temperature, Tables (Data)

Scientific paper

Photometric and spectrographic observations of the RRs variable star XX Cygni are presented. Photometry was obtained in the ubvy beta system by a sky-compensating photometer attached to a 61-cm reflecting telescope. The star is found to have a large light amplitude (0.77 magnitude in V), a reddening of 0.025 magnitude and a small m1 value, indicating low metal content, with a mean effective surface gravity of 3.34 and temperature of 7250 K. Single-trail spectrograms obtained by a 5-m telescope and a coude spectrograph in the wavelength range 3900-4800 A reveal a radial velocity range of 34 km/sec and a mean radial velocity of -110 km/sec, and are consistent with a low metallicity.

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