A Quadrupolar Preplanetary Nebula: IRAS 19475+3119
نویسندگان
چکیده
منابع مشابه
A Starfish Preplanetary Nebula: Iras 19024+0044
Using the Hubble Space Telescope, we have imaged the OH/IR star IRAS 19024+0044 ( I19024) at 0.6, 0.8, 1.1, and 1.6 m, as part of our surveys of candidate preplanetary nebulae. The images show a multipolar nebula of size 3B7 ;2B3, with at least six elongated lobes emanating from the center of the nebula. Two of the lobes show limb-brightened tips having point-symmetric structure with respect to...
متن کاملIRAS 05436–0007 and the Emergence of McNeil’s Nebula
We present a study of McNeil’s Nebula, a newly appeared reflection nebula in the L1630 cloud, together with photometry and spectroscopy of its source. New IR photometry compared to earlier 2MASS data shows that the star has brightened by about 3 magnitudes in the near-infrared, changing its location in a J-H/H-K diagram precisely along a reddening vector. A Gemini NIRI K-band spectrum shows str...
متن کاملIRAS 06562−0337, The Iron Clad Nebula: A New Young Star Cluster
IRAS 06562−0337 has been the recent subject of a classic debate: protoplanetary nebula or young stellar object? We present the first 2μm image of IRAS 06562−0337, which reveals an extended diffuse nebula containing approximately 70 stars inside a 30 radius around a bright, possibly resolved, central object. The derived stellar luminosity function is consistent with that expected from a single c...
متن کاملThe physical structure of the point - symmetric and quadrupolar planetary nebula NGC 6309
Aims. We analyse the point-symmetric planetary nebula NGC 6309 in terms of its three-dimensional structure and of internal variations of the physical conditions to deduce the physical processes involved in its formation. Methods. We used VLA-D λ3.6-cm continuum, ground-based, and HST-archive imaging as well as long slit highand low-dispersion spectroscopy. Results. The low-dispersion spectra in...
متن کاملStudy of the Bipolar Nebula IRAS 19312+1950. I. Mapping Observations
IRAS 19312+1950 is an SiO maser source that exhibits a prominent bipolar nebulosity. Mapping observations of this object were made in the CO J = 1–0, CO J = 1–0, CO J = 1–0, CS J = 2–1, and HCN J = 1–0 lines and in the 150 GHz continuum band. Near-infrared imaging observations were also made in the J , H , and K-bands. The line profiles of the CO and HCN spectra consist of a weak broad componen...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: The Astrophysical Journal
سال: 2007
ISSN: 0004-637X,1538-4357
DOI: 10.1086/511294