EDP Sciences
Free access
Issue
A&A
Volume 380, Number 1, December II 2001
Page(s) L13 - L16
Section Letters
DOI http://dx.doi.org/10.1051/0004-6361:20011508


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. Ashok

Physical 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 ${\rm {\delta}}$ 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 ${\rm {\delta}}$ Sco at present is that of a typical Be star.


Key words: stars: emission-line, Be -- infrared: stars -- techniques: spectroscopic -- stars: individual: ${\rm {\delta}}$ Sco

Offprint request: D. P. K. Banerjee, orion@prl.ernet.in

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