NGC 2264 and NGC 7000/IC revisited: A new search for emission H. cap alpha. stars

Journal Article · Sat Mar 01 04:00:00 EST 1980 · Astron. J.; (United States)

OSTI ID:5662210

Marcy, G W

A slitless spectrographic search for H..cap alpha.. emission stars in NGC 2264 and NGC 7000/IC 5070 has revealed 18 new examples, most of which are presumably T Tau stars. An examination of all known T Tau stars in these fields has uncovered no events of the FU Ori type, except for that of V1057 Cyg. The incompleteness of the search as a function of magnitude and H..cap alpha.. strength is estimated by comparison with Herbig's survey (1954, 1958). It is found that for B<16.0, about 80% of the potential H..cap alpha.. emitters will be found in a survey with this equipment. These results, combined with an estimate of the volume occupied by the association in NGC 2264, yield a volume density of stars that show H..cap alpha.. emission (either now, or eventually if the area is surveyed repeatedly) brighter than B=19 of about 1.6 pc/sup -3/.

• Research Organization: Lick Observatory, Board of Studies in Astronomy and Astrophysics, University of California, Santa Cruz, California 95064
• OSTI ID: 5662210
• Journal Information: Astron. J.; (United States), Journal Name: Astron. J.; (United States) Vol. 85:3; ISSN ANJOA
• Country of Publication: United States
• Language: English

Related Subjects

640102* -- Astrophysics &amp; Cosmology-- Stars &amp; Quasi-Stellar
Radio &amp; X-Ray Sources
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
BALMER LINES
EMISSION SPECTRA
ERUPTIVE VARIABLE STARS
LUMINOSITY
OPTICAL PROPERTIES
PHYSICAL PROPERTIES
SPECTRA
SPECTROSCOPY
STARS
T TAURI STARS
VARIABLE STARS