HD 191110 a SB2 system with HgMn and Hg components

Free access article

Issue		A&A Volume 407, Number 2, August IV 2003


Page(s)		669 - 677
Section		Stellar atmospheres
DOI		http://dx.doi.org/10.1051/0004-6361:20030887

A&A 407, 669-677 (2003)
DOI: 10.1051/0004-6361:20030887

Orbital elements and abundance analysis

G. Catanzaro¹, F. Leone¹ and P. Leto²

¹ INAF - Catania Astrophysical Observatory, Via S. Sofia 78, 95123 Catania, Italy
e-mail: gca@ct.astro.it;fleone@ct.astro.it
² Istituto di Radioastronomia del C.N.R., Stazione VLBI di Noto, CP 161 Noto, Italy
e-mail: pleto@noto.ira.cnr.it

(Received 14 April 2003 / Accepted 22 May 2003 )

Abstract
In this paper we present the first quantitative abundance analysis of the SB2 system with HgMn and Hg components HD 191110. Time-resolved ( $R=14\,000$ ) spectroscopic observations of this system have been obtained during September and October 2002 at the Catania Astrophysical Observatory. Combining these observations with spectra ( $R = 50\,000$ -110 000) taken from the CFHT archive, we refined the orbital period of this system ( $P=9.34661 \pm 0.00002$ d) and then we recalculated the fundamental parameters characterizing its orbit. From the fit of the H $_\beta$ profiles, obtained at different orbital phases, we determined the effective temperatures and surface gravities of each component and the light ratio: $T_{\rm eff}^A=11\,000$ K, $\log g^A=3.60$ , $T_{\rm eff}^B= 10\,700$ K, $\log g^B=3.90$ , $L_{\rm A}/L_{\rm B}=1.20$ . Regarding the chemical composition, both components have solar abundances of sulfur, titanium and iron; magnesium and silicon are slightly underabundant; platinum and yttrium are overabundant. Manganese lines have been detected only in the spectrum of the primary. As to rare-earths, two lines of NdIII have been identified in the secondary's spectrum. Other lines we identified in our spectra belong to PII, CrII, NiII, SrII, ZrII and AuII. We also discuss the isotopic structure of the HgII $\lambda$ 3983.9 Å line.

Key words: stars individual: HD 191110 -- binaries: spectroscopic -- stars: abundances -- stars: early-type -- stars: chemically peculiar

Offprint request: G. Catanzaro, gca@ct.astro.it

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