SIMBAD references

2018AJ....155..242G - Astron. J., 155, 242-242 (2018/June-0)

The star-grazing bodies in the HD 172555 system.

GRADY C.A., BROWN A., WELSH B., ROBERGE A., KAMP I. and RIVIERE MARICHALAR P.

Abstract (from CDS):

Kiefer et al. reported the detection of infalling Ca II absorption in HD 172555, a member of the β Pictoris Moving Group (βPMG). We obtained HST Space Telescope Imaging Spectrograph and Cosmic Origins Spectrograph spectroscopy of this star at 2 epochs separated by a week, and we report the discovery of infalling gas in resonant transitions of Si III and IV, C II and IV, and neutral atomic oxygen. Variable absorption is seen in the C II transitions and is optically thick, with covering factors which range between 58% and 68%, similar to features seen in β Pictoris. The O I spectral profile resembles that of C II, showing a strong low-velocity absorption to +50 km s–1 in the single spectral segment obtained during orbital night, as well as what may be higher-velocity absorption. Studies of the mid-IR spectrum of this system have suggested the presence of silica. The O I absorption differs from that seen in Si III, suggesting that the neutral atomic oxygen does not originate in SiO dissociation products but in a more volatile parent molecule such as CO.

Abstract Copyright: © 2018. The American Astronomical Society. All rights reserved.

Journal keyword(s): comets: general - stars: individual: (HD 172555, Altair, alpha Cep)

Simbad objects: 7

goto Full paper

goto View the reference in ADS

To bookmark this query, right click on this link: simbad:2018AJ....155..242G and select 'bookmark this link' or equivalent in the popup menu


2019.09.23-16:48:47

© Université de Strasbourg/CNRS

    • Contact