2012A&A...543L...2S


C.D.S. - SIMBAD4 rel 1.7 - 2020.09.29CEST18:58:14

2012A&A...543L...2S - Astronomy and Astrophysics, volume 543, L2-2 (2012/7-1)

Discovery of a TiO emission band in the infrared spectrum of the S star NP Aurigae.

SMOLDERS K., VERHOELST T., NEYSKENS P., BLOMMAERT J.A.D.L., DECIN L., VAN WINCKEL H., VAN ECK S., SLOAN G.C., CAMI J., HONY S., DE CAT P., MENU J. and VOS J.

Abstract (from CDS):

We report on the discovery of an infrared emission band in the Spitzer spectrum of the S-type AGB star NP Aurigae that is caused by TiO molecules in the circumstellar environment. We modeled the observed emission to derive the temperature of the TiO molecules (≃600K), an upper limit on the column density (≃1017.25cm–2) and a lower limit on the spatial extent of the layer that contains these molecules. (≃4.6R*). This is the first time that this TiO emission band is observed. A search for similar emission features in the sample of S-type stars yielded two additional candidates. However, owing to the additional dust emission, the identification is less stringent. By comparing the stellar characteristics of NP Aur to those of the other stars in our sample, we find that all stars with TiO emission show large-amplitude pulsations, s-process enrichment, and a low C/O ratio. These characteristics might be necessary requirements for a star to show TiO in emission, but they are not sufficient.

Abstract Copyright:

Journal keyword(s): stars: AGB and post-AGB - circumstellar matter - infrared: stars - techniques: spectroscopic

Simbad objects: 5

goto Full paper

goto View the reference in ADS

Number of rows : 5

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 V* RX Psc S* 01 25 39.1766454607 +21 23 45.962948651   12.62 11.38 14.01   S 20 0
2 * omi Cet Mi* 02 19 20.79210 -02 58 39.4956   7.63 6.53 5.03   M5-9IIIe+DA 1444 0
3 V* NP Aur S* 06 28 01.8059942886 +36 04 59.003568517           M5:S 12 0
4 V* AU Car S* 10 25 29.7327124004 -61 50 59.091417580           MS 10 0
5 V* V899 Aql S* 20 01 29.4477002743 +04 25 36.421674783           S 12 0

    Equat.    Gal    SGal    Ecl

To bookmark this query, right click on this link: simbad:objects in 2012A&A...543L...2S and select 'bookmark this link' or equivalent in the popup menu


2020.09.29-18:58:14

© Université de Strasbourg/CNRS

    • Contact