THE OPTICAL COUNTERPART OF IRAS 12496-7650 - A HIGHLY EMBEDDED HERBIG AE STAR

被引:41
作者
HUGHES, JD
HARTIGAN, P
GRAHAM, JA
EMERSON, JP
MARANG, F
机构
[1] UNIV MASSACHUSETTS,DEPT 5 COLL ASTRON,AMHERST,MA 01003
[2] CARNEGIE INST WASHINGTON,DEPT TERR MAGNETISM,WASHINGTON,DC 20015
[3] UNIV LONDON QUEEN MARY COLL,DEPT PHYS,LONDON E1 4NS,ENGLAND
[4] WESTFIELD COLL,DEPT PHYS,LONDON E1 4NS,ENGLAND
[5] S AFRICAN ASTRON OBSERV,CAPE TOWN 7935,SOUTH AFRICA
关键词
D O I
10.1086/115743
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We report optical and near-infrared observations of IRAS 12496 - 7650, an active young star and the most luminous IRAS source in the Chamaeleon II dark cloud. The object has become brighter at optical wavelengths since 1976, and has exhibited brightness variations of more than a magnitude at K between January 1987 and May 1990. IRAS 12496 - 7650 is redder when fainter, and the amplitude of the brightness fluctuations decreases towards longer infrared wavelengths. Differing amounts of circumstellar extinction or intrinsic color variations of the source can produce most of the observed variability. Optical spectra confirm that IRAS 12496 - 7650 is an extremely active (probably Herbig Ae type) star with blueshifted forbidden lines of [O I] and [S II] and a prominent P-Cygni profile at H-alpha. The [S II] emission extends 3-4 arcsec on either side of the star and shows a significant velocity gradient, suggestive of a jetlike structure. The detection of outflowing material from IRAS 12496 - 7650 reinforces earlier evidence that this object is the exciting source for the HH 52-54 group Herbig-Haro objects. The broad spectral energy distribution suggests that IRAS 12496 - 7650 has a circumstellar disk.
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页码:1013 / 1020
页数:8
相关论文
共 38 条
[1]  
[Anonymous], 1962, ADAA, DOI [DOI 10.1016/B978-1-4831-9919-1.50006-6, 10.1016/B978-1-4831-9919-1.50006-6]
[2]  
APPENZELLER I, 1984, ASTRON ASTROPHYS, V141, P108
[3]  
BASTIAN U, 1983, ASTRON ASTROPHYS, V126, P438
[4]   JHKLM PHOTOMETRY - STANDARD SYSTEMS, PASSBANDS, AND INTRINSIC COLORS [J].
BESSELL, MS ;
BRETT, JM .
PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF THE PACIFIC, 1988, 100 (631) :1134-1151
[5]  
CARTER BS, 1990, MON NOT R ASTRON SOC, V242, P1
[6]  
CATALA C, 1989, LOW MASS STAR FORMAT, P471
[7]   IRAS OBSERVATIONS OF THE EXCITING STARS OF HERBIG-HARO OBJECTS [J].
COHEN, M ;
SCHWARTZ, RD .
ASTROPHYSICAL JOURNAL, 1987, 316 (01) :311-&
[8]  
de Vries C. P., 1984, Astronomy & Astrophysics Supplement Series, V56, P333
[9]  
EDWARDS S, 1986, ASTROPHYS J, V307, pL65, DOI 10.1086/184729
[10]  
EDWARDS S, 1990, COMMUNICATION