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)
· On-line Data
· References in the article
· Citations to the Article (7) (Citation History)
· Refereed Citations to the Article
· SIMBAD Objects (163)
· Associated Articles
· Also-Read Articles (Reads History)
·
· Translate This Page
Title:
Optical spectroscopic and 2MASS measurements of Stephenson Halpha stars
Authors:
Maheswar, G.; Manoj, P.; Bhatt, H. C.
Affiliation:
AA(Indian Institute of Astrophysics, Bangalore 560 034, India ), AB(Indian Institute of Astrophysics, Bangalore 560 034, India ), AC(Indian Institute of Astrophysics, Bangalore 560 034, India )
Publication:
Astronomy and Astrophysics, v.402, p.963-970 (2003) (A&A Homepage)
Publication Date:
05/2003
Origin:
A&A
A&A Keywords:
stars: emission-line, Be, stars: general, stars: pre-main sequence, stars: late-type, infrared: stars
DOI:
10.1051/0004-6361:20030315
Bibliographic Code:
2003A&A...402..963M

Abstract

We present the results of spectroscopic observations for 52 objects from the list of Halpha emission stars of Stephenson (\cite{Ste86}). Out of six known T Tauri stars observed, five showed Halpha in emission and in one (StHa 40), Halpha changed from being in absorption to emission over a period of two years, accompanied by photometric and spectral type variability. We confirm the T Tauri nature of one Stephenson object (StHa 48) on the basis of the presence of Halpha and Hbeta in emission, Li I lambda6708 in absorption, infrared excess and X-ray emission. Among the 52 objects observed, there were other emission line objects: 1 Ke star, 1 BQ[ ] star, 2 galaxies and 2 Be stars. We present a higher-resolution spectrum of StHa 62 showing permitted and forbidden lines in emission typical of BQ[ ] stars. Twenty five out of 30 newly observed objects failed to show Halpha in emission. We also present 2MASS observations for 112 StHa objects. We suggest three Stephenson objects (StHa 52, 125 and 129) to be YSOs on the basis of 2MASS, IRAS and ROSAT observations. These and all other known YSOs amongst StHa stars are found in regions of star-forming clouds in Taurus, Orion and Ophiuchus. YSOs at high galactic latitudes in other parts of the sky are therefore rare.

Table 2 is only available in electronic form at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (130.79.128.5) or via http://cdsweb.u-strasbg.fr/cgi-bin/qcat?J/A+A/402/963

Associated Articles

Source Paper     Catalog Description    

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