An FU Orionis star associated with Herbig-Haro object 57

Details An FU Orionis star associated with Herbig-Haro object 57 An FU Orionis star associated with Herbig-Haro object 57

Feb 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985apj...289..331g&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 289, Feb. 1, 1985, p. 331-341.

Astronomy and Astrophysics

Astrophysics

67

Herbig-Haro Objects, Infrared Stars, Pre-Main Sequence Stars, Variable Stars, Astronomical Photometry, Charge Coupled Devices, F Stars, H Alpha Line, Photographic Plates, Spectral Energy Distribution, Stellar Envelopes, Stellar Evolution, Stellar Spectrophotometry

Scientific paper

An FU Orionis star, discovered in 1983 and which has appeared on the NE edge of Herbig-Haro (HH) object 57 is described. Past and present photographs of the region are presented. Photometric observations, made through standard V and B filters and also in the infrared are discussed. The photometry shows a strong infrared excess and is consistent with an F star surrounded by a two-component dust shell with temperatures of 2000 K and 325 K in addition to a stellar energy distribution appropriate to 6500 K. Spectrographic observations made in the red and near-infrared show that the star ejects an optically thin shell which produces a P Cygni profile at H-alpha with a violet absorption edge at - 440 km/s. The H-alpha peaks at a heliocentric velocity near zero. The character of the H-alpha feature varies over a period of months. The Ca II triplet is seen in emission in the lambda-8500 region and its velocities are within 30 km/s of zero. Unlike the H-alpha emission peak, the forbidden S II doublet observed at 6716/6713 A is blueshifted and shows a heliocentric velocity of - 85 + or - 5 km/s which is indicative of new HH activity close to the surface of the star. The importance of FU Orionis stars and the HH 57 star in early stellar evolution is considered.

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