Sign on

SAO/NASA ADS Astronomy Abstract Service


· Find Similar Abstracts (with default settings below)
· Full Refereed Journal Article (PDF/Postscript)
· Full Refereed Scanned Article (GIF)
· References in the article
· Citations to the Article (19) (Citation History)
· Refereed Citations to the Article
· SIMBAD Objects (5)
· Associated Articles
· Reads History
·
· Translate This Page
Title:
Optical studies of UHURU sources. XII - The light curve of Scorpius X-1 = V818 Scorpii, 1889-1974
Authors:
Wright, E. L.; Gottlieb, E. W.; Liller, W.
Affiliation:
AA(Smithsonian Astrophysical Observatory and Harvard College Observatory, Cambridge, Mass.), AB(Smithsonian Astrophysical Observatory and Harvard College Observatory, Cambridge, Mass.)
Publication:
Astrophysical Journal, vol. 200, Aug. 15, 1975, pt. 1, p. 171-176. (ApJ Homepage)
Publication Date:
08/1975
Category:
Astronomy
Origin:
STI
NASA/STI Keywords:
Binary Stars, Light Curve, Stellar Luminosity, Uhuru Satellite, X Ray Sources, Gravitational Collapse, Radial Velocity, Stellar Radiation, Stellar Spectrophotometry, X Ray Stars
DOI:
10.1086/153774
Bibliographic Code:
1975ApJ...200..171W

Abstract

An analysis of 1068 photographic observations of V818 Sco = Sco X-1 from the Harvard plate collection, as well as 698 post discovery magnitudes, shows that its B magnitude ranges between 11.8 and 13.7. However, there is strong evidence that Sco X-1 has been systematically fainter by 0.3-0.4 mag since the mid-1960s. All the available magnitudes have been combined to give an improved mean light curve at the .787313-day period derived by Gottlieb, Wright, and Liller. The double period light curve, folded at 1.574626 days, is also given and discussed. The radial velocity curve, based on published data, and the variations in color make it possible to draw new conclusions on plausible models for Sco X-1.

Associated Articles

Part  1     Part  2     Part  3     Part  4     Part  5     Part  6     Part  7     Part  8     Part  9     Part 10     Part 11    


Printing Options

Print whole paper
Print Page(s) through

Return 600 dpi PDF to Acrobat/Browser. Different resolutions (200 or 600 dpi), formats (Postscript, PDF, etc), page sizes (US Letter, European A4, etc), and compression (gzip,compress,none) can be set through the Printing Preferences



More Article Retrieval Options

HELP for Article Retrieval


Bibtex entry for this abstract   Preferred format for this abstract (see Preferences)

  New!

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