100 citations · 265 across the 13 of their papers we have counts for
13 papers
The First Infrared Portrait of A Solar-Like Host Star with Debris Disk: Pioneering High-Resolution H- and K-Band Spectroscopy of HD115617 with Comparative Optical Spectrum Analysis
Sena Aleyna Şentürk, Timur Şahin, Cenk Kayhan
We present the first high-resolution near-infrared spectroscopic analysis of the solar analog HD115617 (61 Virginis), complemented by optical spectroscopy, asteroseismology, and sp…
Dynamical parallax, physical parameters and evolutionary status of the components of the bright eclipsing binary α Draconis
K. Pavlovski, C. A. Hummel, A. Tkachenko +13
Altough both components of the bright eclipsing binary Dra having been resolved using long baseline interferometry and the secondary component shown to contribute some 15\% of…
On the Origin of Metal-poor Stars in the Solar Neighborhood
Timur Sahin, Selcuk Bilir
We determined the ages, the kinematic parameters and Galactic orbital parameters of six metal-poor (-2.4<[Fe/H]<-1 dex) F-type high proper motion (HPM) stars to investigate their H…
HD 179821 (V1427 Aql, IRAS 19114+0002) -- A Massive Post-Red Supergiant Star?
Timur Sahin, David L. Lambert, Valentina G. Klochkova +1
We have derived elemental abundances of a remarkable star, HD 179821, with unusual composition (e.g. [Na/Fe]=1.00.2 dex) and extra-ordinary spectral characteristics. Its metal…
High Resolution Echelle Spectroscopy of Two High Proper Motion Stars: HD 102870 and BD+20 3603
S. Oktay Solakci, Timur Sahin, Christopher Flynn +1
A chemical abundance analysis is made of two F type high proper motion stars selected from the {\sc ELODIE} library. We use high resolution (R=42\,000) and high signal to noise rat…
Spectroscopic followup of three bright halo stars selected from SDSS and GALEX photometry
Timur Sahin, David L. Lambert, Carlos Allende Prieto
We aim to reveal the nature of the Sloan Digital Sky Survey (SDSS) stars: SDSSJ100921.40+375233.9, SDSSJ015717.04+135535.9, and SDSSJ171422.43+283657.2, showing apparently high NUV…
A multisite photometric study of two unusual Beta Cep stars: the magnetic V2052 Oph and the massive rapid rotator V986 Oph
G. Handler, R. R. Shobbrook, K. Uytterhoeven +15
We report a multisite photometric campaign for the Beta Cep stars V2052 Oph and V986 Oph. 670 hours of high-quality differential photoelectric Stromgren, Johnson and Geneva time-se…
Spectroscopic investigation of SDSS J100921.40+375233.9 selected from SDSS and GALEX photometry
Timur Sahin, David L. Lambert, Carlos Allende Prieto
In this study, we aim to reveal the nature of the Sloan Digital Sky Survey (SDSS) star: SDSS J100921.40+375233.9, suspected to have an extremely low metallicity. We observed this s…
Abundance analyses of helium-rich subluminous B stars
N. Naslim, C. S. Jeffery, A. Ahmad +2
The connection between helium-rich hot subdwarfs of spectral types O and B (He-sdB) has been relatively unexplored since the latter were found in significant numbers in the 1980's.…
High Resolution Optical Spectroscopy of the F Supergiant Proto-Planetary Nebula V887 Her=IRAS 18095+2704
Timur Sahin, David L. Lambert, Valentina G. Klochkova +1
An abundance analysis is presented for IRAS 18095+2704 (V887 Her), a post-AGB star and proto-planetary nebula. The analysis is based on high-resolution optical spectra from the McD…
Surprising Metallicity of a Newly Discovered M79 Post-AGB Star
Timur Sahin, David L. Lambert
A detailed chemical composition analysis based on a high-resolution (R=35,000) CCD spectrum is presented for a newly discovered post-AGB star in the globular cluster M79 for the fi…
High Resolution Optical Spectroscopy of a Newly Discovered Post-AGB Star with a Surprising Metallicity in the Globular Cluster M79
T. Sahin, David L. Lambert
An abundance analysis based on a high-resolution spectrum is presented for a newly discovered post-AGB star in the globular cluster M79. The surprising result is that the iron abun…
Asteroseismology of the Beta Cephei star 12 (DD) Lacertae: photometric observations, pulsational frequency analysis and mode identification
G. Handler, M. Jerzykiewicz, E. Rodriguez +28
We report a multisite photometric campaign for the Beta Cephei star 12 Lacertae. 750 hours of high-quality differential photoelectric Stromgren, Johnson and Geneva time-series phot…