Abstract
view Abstract Citations (12) References (25) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Chromospherically Active Stars. IV. HD 178450=V478 LYR: an Early-Type BY Draconis Type Binary Fekel, Francis C. Abstract The variable star HD 178450 = V478 Lyr is a chromospherically active G8 V single-lined spectroscopic binary with a period of 2.130514 days. This star has strong ultraviolet emission features and a filled-in Hα absorption line which is variable in strength. It is classified as an early-type BY Draconis system and is similar in many respects to the BY Dra star HD 175742 = V775 Her. The unseen secondary of HD 178450 has a mass of about 0.3 M_sun; and is probably an M2-M3 dwarf. The inclination of the system is 67°±12°. The lithium abundance of the G8 dwarf results in an age for the system that is somewhat less than that of the Hyades cluster. The system is relatively nearby, with an estimated distance of 26 pc, or a parallax of 0arcsec.039. Publication: The Astronomical Journal Pub Date: January 1988 DOI: 10.1086/114630 Bibcode: 1988AJ.....95..215F Keywords: Binary Stars; Chromosphere; Lyra Constellation; Stellar Activity; Astronomical Photometry; Early Stars; H Alpha Line; Ultraviolet Spectra; Astrophysics; ANALYTICAL METHODS; STARS: ATMOSPHERES; STARS: BINARIES full text sources ADS | data products SIMBAD (4) MAST (1) Related Materials (25) Part 1: 1985AJ.....90.2581F Part 2: 1986AJ.....92.1150F Part 3: 1987AJ.....94..726F Part 5: 1988AJ.....96.1426F Part 6: 1989AJ.....97..202F Part 7: 1989AJ.....97.1139F Part 8: 1991AJ....101.1489F Part 9: 1991AJ....102.1439F Part 10: 1993AJ....105.2265F Part 11: 1993AJ....106.2370F Part 12: 1994AJ....108..694F Part 13: 1994AJ....108.1936F Part 14: 1995AJ....109.2821F Part 15: 1996AJ....112..269F Part 16: 1997AJ....114.2747F Part 17: 1998AJ....115.1153F Part 18: 2000AJ....120.3265F Part 19: 2001AJ....122..991F Part 20: 2001AJ....122.3447F Part 21: 2002AJ....124.1064F Part 22: 2004AJ....127.2303F Part 23: 2004AJ....127.2931F Part 24: 2005AJ....129.1669F Part 25: 2005AJ....130..794F Part 26: 2007AJ....134.2079F
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