Bibcode
González Hernández, J. I.; Iglesias-Groth, S.; Rebolo, R.; García-Hernández, D. A.; Manchado, A.; Lambert, D. L.
Bibliographical reference
The Astrophysical Journal, Volume 706, Issue 1, pp. 866-876 (2009).
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11
2009
Journal
Citations
14
Refereed citations
14
Description
We present an abundance analysis of the star Cernis 52 in whose spectrum
we recently reported the naphthalene cation in absorption at 6707.4
Å. This star is on a line of sight to the Perseus molecular
complex. The analysis of high-resolution spectra using a
χ2-minimization procedure and a grid of synthetic spectra provides
the stellar parameters and the abundances of O, Mg, Si, S, Ca, and Fe.
The stellar parameters of this star are found to be T eff =
8350 ± 200 K, log(g/cm s2)=4.2 ± 0.4 dex. We
derived a metallicity of [Fe/H] = -0.01 ± 0.15. These stellar
parameters are consistent with a star of ~2 M sun in a
pre-main-sequence evolutionary stage. The stellar spectrum is
significantly veiled in the spectral range λλ5150-6730
Å up to almost 55% of the total flux at 5150 Å and
decreasing toward longer wavelengths. Using Johnson-Cousins and Two
Micron All Sky Survey photometric data, we determine a distance to
Cernis 52 of 231+135 -85 pc considering the error
bars of the stellar parameters. This determination places the star at a
similar distance to the young cluster IC 348. This together with its
radial velocity, vr = 13.7 ± 1 km s-1, its
proper motion and probable young age support Cernis 52 as a likely
member of IC 348. We determine a rotational velocity of vsin i = 65
± 5 km s-1 for this star. We confirm that the stellar
resonance line of Li I at 6707.8 Å is unable to fit the broad
feature at 6707.4 Å. This feature should have a interstellar
origin and could possibly form in the dark cloud L1470 surrounding all
the cluster IC 348 at about the same distance.
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García Hernández