Optical Identification and Spectroscopy of EUV Sources

Details Optical Identification and Spectroscopy of EUV Sources Optical Identification and Spectroscopy of EUV Sources

Dec 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994aas...185.8014c&link_type=abstract

American Astronomical Society, 185th AAS Meeting, #80.14; Bulletin of the American Astronomical Society, Vol. 26, p.1448

Other

Scientific paper

We present optical identification and analysis of previously unidentified extreme ultraviolet (EUV) sources (60--200 Angstroms) discovered with the Extreme Ultraviolet Explorer (EUVE) during the all-sky and deep surveys. Two EUVE deep survey sources, EUVE_J0318+184 and EUVE_J2056-171, are identified as active, young, late-type stars. They display strong Hα , Ca ii H and K emission, and Li 6707.8 Angstroms absorption suggesting spectral types of dM0e. A very strong flare with energy in excess of 10(35) erg was also observed on EUVE_J2056-171 (Mathioudakis et al. 1994, in prep.). We also identified four previously cataloged EUVE sources: EUVE_J1918+59.9, EUVE_J2249+58.5, EUVE_J0419+21.7, and EUVE_J2329+41.4. The first two sources are identified in both the ROSAT Wide Field Camera and the EUVE catalogs as unclassified ``stars.'' They are in fact hot DA white dwarfs showing a clean optical spectrum with broad Balmer lines. EUVE_J0419+21.7 was previously assigned a possible identification with 56 Tau, an A0sp star. Optical spectra of other candidates within the error circle, in addition to the bright A star, show three emission line dMe stars in the field. We attribute the EUV emission to one or more of this collection of dMe stars. The source EUVE_J2329+41.4 is currently identified as probably being G 190--28 with spectral type M. However we show that both G 190--28 and G 190--27 are dMe stars and are located within the error circle of the EUVE position of this source, and therefore both of these stars probably contribute to the EUV emission. This work has been supported by NASA contract NAS5-29298.

Affiliated with

Also associated with

No associations

Rating

Optical Identification and Spectroscopy of EUV Sources does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Optical Identification and Spectroscopy of EUV Sources, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Optical Identification and Spectroscopy of EUV Sources will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1321945