Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999a%26a...345..583p&link_type=abstract
Astronomy and Astrophysics, v.345, p.583-591 (1999)
Astronomy and Astrophysics
Astrophysics
17
Stars: Coronae, Stars: Individual: Ec 95: J182958+011247, Stars: Individual: Ec 95: J182958+011252, Stars: Magnetic Fields, Stars: Pre-Main Sequence, X-Rays: Stars
Scientific paper
We present near-infrared spectra for the highly obscured, optically invisible young stellar object EC 95 in the Serpens molecular cloud, from which we recently could detect strong X-ray emission with ROSAT. Its location in the HR diagram suggests this object to be an extremely young ( ~ 2 x 10(5) yr old) intermediate-mass ( ~ 4;M_sun) star, which is most likely the progenitor of a B-type or early A-type main sequence star. The only reasonable explanation for its extremely strong X-ray emission (L_X ~ 1.2 x 10(33) erg/sec) seems to be coronal, i.e. magnetic activity; this view is also supported by the strong radio emission of EC 95. This is quite surprising, since one usually does not expect a magnetic field on intermediate-mass stars, which are thought to lack surface convection zones, the prerequisite for a solar-like dynamo effect. A possible explanation might be that EC 95 currently goes through a short period of deuterium shell burning, which causes convection near the stellar surface and might give rise to a dynamo effect and a corona. Mainly based on observations collected at the United Kingdom Infrared Telescope, Hawaii, USA
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