Sign on

SAO/NASA ADS Astronomy Abstract Service

· Find Similar Abstracts (with default settings below)
· Electronic Refereed Journal Article (HTML)
· Full Refereed Journal Article (PDF/Postscript)
· arXiv e-print (arXiv:astro-ph/0202268)
· On-line Data
· References in the article
· Citations to the Article (14) (Citation History)
· Refereed Citations to the Article
· SIMBAD Objects (3)
· Also-Read Articles (Reads History)
·
· Translate This Page
Title:
HST observations rule out the association between Cir X-1 and SNR G321.9-0.3
Authors:
Mignani, R. P.; De Luca, A.; Caraveo, P. A.; Mirabel, I. F.
Affiliation:
AA(ESO, Karl Schwarzschild Str. 2, 85748 Garching bei München, Germany), AB(Istituto di Fisica Cosmica del CNR ``G. Occhialini", Via Bassini 15, 20133 Milan, Italy; Universitá di Milano Bicocca, Dipartimento di Fisica, Piazza della Scienza 3, 20126 Milano, Italy), AC(Istituto di Fisica Cosmica del CNR ``G. Occhialini", Via Bassini 15, 20133 Milan, Italy), AD(Service d'Astrophysique / CEA, CE-Saclay, 91191 Gif-sur-Yvette, France; Instituto de Astronomía y Física del Espacio/CONICET. cc5, 1428 Bs As, Argentina)
Publication:
Astronomy and Astrophysics, v.386, p.487-491 (2002) (A&A Homepage)
Publication Date:
05/2002
Origin:
A&A
A&A Keywords:
X-ray: Binaries, ISM: Individual Objects: SNR G321.9-0.3, Stars: Individual: Cir X-1
DOI:
10.1051/0004-6361:20020224
Bibliographic Code:
2002A&A...386..487M

Abstract

Cir X-1 is one of the most intriguing galactic X-ray sources. It is a ~16.6 days variable X/radio source, a type-I X-ray burster and a QPO emitter. In spite of an uncertain optical counterpart classification, all these properties identify the source as an LMXB. The morphology of the surrounding radio nebula has suggested an association with the nearby ( ~ 25 arcmin) SNR G321.9-0.3, implying that Cir X-1 is a runaway binary originated from the supernova explosion {~} 105 years ago. To investigate this hypothesis, we carried out a proper motion measurement of the Cir X-1 m ~ 19 optical counterpart using a set of HST/WFC and WFPC2 observations taken ~ 8.6 years apart. We obtained a 3 sigma upper limit of ~5 mas yr-1 on the source proper motion. Since the runaway hypothesis would have implied a proper motion due North ranging between 15 and 75 mas yr-1, depending on the actual age of the SNR, our result definitively rules out the association between Cir X-1 and SNR G321.9-0.3. Based on observations with the NASA/ESA Hubble Space Telescope, obtained at the Space Telescope Science Institute, which is operated by AURA, Inc. under contract No NAS 5-26555.
Bibtex entry for this abstract   Preferred format for this abstract (see Preferences)
   

Find Similar Abstracts:

Use: Authors
Title
Keywords (in text query field)
Abstract Text
Return: Query Results Return    items starting with number
Query Form
Database: Astronomy
Physics
arXiv e-prints