Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994aj....108.1936f&link_type=abstract
The Astronomical Journal (ISSN 0004-6256), vol. 108, no. 5, p. 1936-1939
Astronomy and Astrophysics
Astronomy
1
Binary Stars, Chromosphere, Dwarf Stars, Light (Visible Radiation), Line Spectra, Orbital Elements, Stellar Activity, Stellar Orbits, Stellar Rotation, Stellar Spectra, Visible Spectrum, Astronomical Spectroscopy, Charge Coupled Devices, Eccentric Orbits, Spectrographs, Stellar Mass
Scientific paper
HD 30957 is a double-lined spectroscopic binary with a period of 44.395 days and a modest eccentricity of 0.09. The spectral types of the components are K2-3 V and K5 V. The measured v sin i for both components is less than or equal to 3 km/s and the orbital inclination is estimated to be 69 deg. The system is relatively nearby with a parallax of 0.025 sec or a distance of 40 pc. Space motions of the system indicate that it does not belong to any of the known moving groups. Absolute surface fluxes of the Ca II H and K lines have been recomputed and indicate only modest chromospheric activity. If the stars are rotating pseudosynchronously, the lack of light variability is consistent with the value of the critical Rossby number for starspot activity.
Dadonas Virgilijus
Fekel Francis C.
Patterson Randen L.
Sperauskas Julius
Vaccaro Todd Russell
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