SIMBAD references

2016ApJ...833..286H - Astrophys. J., 833, 286-286 (2016/December-3)

A profile analysis of raman-scattered O VI bands at 6825 Å and 7082 Å in Sanduleak's star.

HEO J.-E., ANGELONI R., DI MILLE F., PALMA T. and LEE H.-W.

Abstract (from CDS):

We present a detailed modeling of the two broad bands observed at 6825 and 7082 Å in Sanduleak's star, a controversial object in the Large Magellanic Cloud. These bands are known to originate from Raman scattering of O VI λλ 1032 and 1038 photons with atomic hydrogen and are only observed in bona fide symbiotic stars. Our high-resolution spectrum obtained with the Magellan Inamori Kyocera Echelle spectrograph at the Magellan-Clay Telescope reveals, quite surprisingly, that the profiles of the two bands look very different: while the Raman 6825 A band shows a single broad profile with a redward extended bump, the Raman 7082 A band exhibits a distinct triple-peak profile. Our model suggests that the O vi emission nebula can be decomposed into a red, blue, and central emission region from an accretion disk, a bipolar outflow, and a further compact, optically thick region. We also perform Monte Carlo simulations with the aim of fitting the observed flux ratio F(6825)/F(7082) ∼ 4.5, which indicates that the neutral region in Sanduleak's star is characterized by the column density N_H i_ ∼ 1 x 1023 cm–2.

Abstract Copyright: © 2016. The American Astronomical Society. All rights reserved.

Journal keyword(s): binaries: symbiotic - line: profiles - radiative transfer - scattering - stars: individual: Sanduleak's star - stars: individual: Sanduleak's star

Simbad objects: 7

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2020.02.21-23:19:49

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