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A&A 380, L13-L16 (2001)
DOI: 10.1051/0004-6361:20011508
Near infra-red and optical spectroscopy of Delta Scorpii
D. P. K. Banerjee, P. Janardhan and N. M. AshokPhysical Research Laboratory, Navrangpura, Ahmedabad -380 009, India
e-mail: orion, jerry, ashok@prl.ernet.in
(Received 26 September 2001 / Accepted 14 October 2001 )
Abstract
Spectroscopic observations of
Sco in the near IR and optical
wavelengths, obtained shortly after its recent periastron passage
are reported. The IR spectra are dominated by the HI Paschen and
Brackett lines. An IR excess is seen which can be attributed to
free-free emission from a circumstellar shell. The observed Paschen
and Brackett line intensities deviate significantly from Case B
predictions and indicate optical depth effects. These effects are
modeled. The overall spectral behaviour of
Sco at present
is that of a typical Be star.
Key words: stars: emission-line, Be -- infrared: stars -- techniques: spectroscopic -- stars: individual:
Sco
Offprint request: D. P. K. Banerjee, orion@prl.ernet.in
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