Observations of the 6 cm lines of OH in evolved (OH/IR) stars

被引：3
|
作者：
Fish, Vincent L.
Zschaechner, Laura K.
Sjouwerman, Lorant O.
Pihlstrom, Ylva M.
Claussen, Mark J.
机构：
[1] Univ Montana, Dept Phys & Astron, Missoula, MT 59812 USA
[2] Natl Radio Astron Observ, Socorro, NM 87801 USA
[3] Univ New Mexico, Dept Phys & Astron, Albuquerque, NM 87131 USA
来源：
ASTROPHYSICAL JOURNAL | 2006年 / 653卷 / 01期
基金：
美国国家科学基金会;
关键词：
ISM; individual; (LDN; 1084; Monoceros R2); masers; radio lines : stars; stars : AGB and post-AGB; stars : late-type;
D O I：
10.1086/510382
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
Recent observational and theoretical advances have called into question traditional OH maser pumping models in evolved (OH/IR) stars. The detection of excited-state OH lines would provide additional constraints to discriminate among these theoretical models. In this Letter, we report on VLA observations of the 4750 and 4765 MHz lines of OH toward 45 sources, mostly evolved stars. We detect 4765 MHz emission in the star-forming regions Mon R2 and LDN 1084, but we do not detect excited-state emission in any evolved stars. The flux density and velocity of the 4765 MHz detection in Mon R2 suggest that a new flaring event has begun.
引用
收藏
页码：L45 / L48
页数：4
相关论文
共 50 条
  • [21] On dead OH/IR stars
    Lewis, BM
    ASTROPHYSICAL JOURNAL, 2002, 576 (01): : 445 - 449
  • [22] HIGH-RESOLUTION 18-CM SPECTRA OF OH/IR STARS
    FIX, JD
    ASTRONOMICAL JOURNAL, 1987, 93 (02): : 433 - 439
  • [23] Mainline and water Maser observations of OH/IR stars in the Arecibo sky
    Lewis, BM
    PLANETARY NEBULAE, 1997, (180): : 356 - 356
  • [24] VERY LONG BASELINE INTERFEROMETRIC OBSERVATIONS OF OH-IR STARS
    REID, MJ
    MUHLEMAN, DO
    ASTROPHYSICAL JOURNAL, 1975, 196 (01): : L35 - L37
  • [25] VLBI OBSERVATIONS OF CIRCUMSTELLAR SHELLS AROUND 2 OH IR STARS
    NORRIS, RP
    BOOTH, RS
    DIAMOND, PJ
    NYMAN, LA
    GRAHAM, DA
    MATVEYENKO, LI
    MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 1984, 208 (02) : 435 - 446
  • [26] OH IR STARS WITHOUT OH MASERS - NONDETECTION STATISTICS
    LEWIS, BM
    EDER, J
    TERZIAN, Y
    ASTRONOMICAL JOURNAL, 1987, 94 (04): : 1025 - 1034
  • [27] OBSERVATIONS OF YOUNG STELLAR CLUSTERS IN 18-CM OH LINES
    RUDNITSKIJ, GM
    ASTRONOMICHESKII ZHURNAL, 1978, 55 (02): : 345 - 349
  • [28] OBSERVATIONS OF COLD IRAS SOURCES IN THE 18-CM OH LINES
    PASHCHENKO, MI
    LESKEREN, AM
    ASTRONOMY LETTERS-A JOURNAL OF ASTRONOMY AND SPACE ASTROPHYSICS, 1994, 20 (01): : 69 - 71
  • [29] MASS-LOSS FROM EVOLVED STARS .7. OH MASER SHELL RADII AND MASS-LOSS RATES FOR OH/IR STARS
    NETZER, N
    KNAPP, GR
    ASTROPHYSICAL JOURNAL, 1987, 323 (02): : 734 - 748
  • [30] Circumstellar Envelopes of OH/IR Stars
    Ruiz-Velasco, A. E.
    Wittkowski, M.
    Driebe, T.
    Wachter, A.
    Hofner, S.
    WHY GALAXIES CARE ABOUT AGB STARS II: SHINING EXAMPLES AND COMMON INHABITANTS, 2011, 445 : 369 - +
12345