Sökning: onr:"swepub:oai:DiVA.org:uu-304411" >
Spectral Properties...
-
Brewer, John M.Yale Univ, Dept Astron, New Haven, CT 06511 USA.;260 Whitney Ave, New Haven, CT 06511 USA.
(författare)
Spectral Properties Of Cool Stars : Extended Abundance Analysis Of 1,617 Planet-Search Stars
- Artikel/kapitelEngelska2016
Förlag, utgivningsår, omfång ...
-
2016-08-23
-
American Astronomical Society,2016
-
printrdacarrier
Nummerbeteckningar
-
LIBRIS-ID:oai:DiVA.org:uu-304411
-
https://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-304411URI
-
https://doi.org/10.3847/0067-0049/225/2/32DOI
Kompletterande språkuppgifter
-
Språk:engelska
-
Sammanfattning på:engelska
Ingår i deldatabas
Klassifikation
-
Ämneskategori:ref swepub-contenttype
-
Ämneskategori:art swepub-publicationtype
Anmärkningar
-
We present a catalog of uniformly determined stellar properties and abundances for 1,617 F, G, and K stars using an automated spectral synthesis modeling procedure. All stars were observed using the HIRES spectrograph at Keck Observatory. Our procedure used a single line list to fit model spectra to observations of all stars to determine effective temperature, surface gravity, metallicity, projected rotational velocity, and the abundances of 15 elements (C, N, O, Na, Mg, Al, Si, Ca, Ti, V, Cr, Mn, Fe, Ni, and Y). Sixty percent of the sample had Hipparcos parallaxes and V-band photometry, which we combined with the spectroscopic results to obtain mass, radius, and luminosity. Additionally, we used the luminosity, effective temperature, metallicity and alpha-element enhancement to interpolate in the Yonsei-Yale isochrones to derive mass, radius, gravity, and age ranges for those stars. Finally, we determined new relations between effective temperature and macroturbulence for dwarfs and subgiants. Our analysis achieved precisions of 25 K in T-eff, 0.01. dex in [M/H], 0.028. dex for log g,. and 0.5 km s(-1) in v sin i based on multiple observations of the same stars. The abundance results were similarly precise, between similar to 0.01 and similar to 0.04. dex, though trends with respect to T-eff remained for which we derived empirical corrections. The trends, though small, were much larger than our uncertainties and are shared with published abundances. We show that changing our model atmosphere grid accounts for most of the trend in [M/H] between 5000 and 5500 K, indicating a possible problem with the atmosphere models or opacities.
Ämnesord och genrebeteckningar
Biuppslag (personer, institutioner, konferenser, titlar ...)
-
Fischer, Debra A.Yale Univ, Dept Astron, New Haven, CT 06511 USA.;260 Whitney Ave, New Haven, CT 06511 USA.
(författare)
-
Valenti, Jeff A.Space Telescope Sci Inst, 3700 San Martin Dr, Baltimore, MD 21218 USA.;3700 San Martin Dr, Baltimore, MD 21218 USA.
(författare)
-
Piskunov, NikolaiUppsala universitet,Observationell astrofysik(Swepub:uu)nikopisk
(författare)
-
Yale Univ, Dept Astron, New Haven, CT 06511 USA.;260 Whitney Ave, New Haven, CT 06511 USA.Space Telescope Sci Inst, 3700 San Martin Dr, Baltimore, MD 21218 USA.;3700 San Martin Dr, Baltimore, MD 21218 USA.
(creator_code:org_t)
Sammanhörande titlar
-
Ingår i:Astrophysical Journal Supplement Series: American Astronomical Society225:20067-00491538-4365
Internetlänk
Hitta via bibliotek
Till lärosätets databas