Near infra-red and optical spectroscopy of Delta Scorpii

Citation
Dpk. Banerjee et al., Near infra-red and optical spectroscopy of Delta Scorpii, ASTRON ASTR, 380(1), 2001, pp. L13-L16
Citations number
19
Categorie Soggetti
Space Sciences
Journal title
ASTRONOMY & ASTROPHYSICS
ISSN journal
14320746 → ACNP
Volume
380
Issue
1
Year of publication
2001
Pages
L13 - L16
Database
ISI
SICI code
1432-0746(200112)380:1<L13:NIAOSO>2.0.ZU;2-D
Abstract
Spectroscopic observations of delta Sco in the near IR and optical waveleng ths, obtained shortly after its recent periastron passage are reported. The IR spectra are dominated by the HI Paschen and Brackett lines. An IR exces s is seen which can be attributed to free-free emission from a circumstella r shell. The observed Paschen and Brackett line intensities deviate signifi cantly from Case B predictions and indicate optical depth effects. These ef fects are modeled. The overall spectral behaviour of delta Sco at present i s that of a typical Be star.