Separation of dwarf and giant stars with ROTSE–IIId

Bilir, S.; Güver, T.; Aslan, Mustafa

doi:10.1002/asna.200510614

Cited by 22 publications

(19 citation statements)

References 17 publications

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“…We used the equations of Fiorucci & Munari (2003) (see also, Bilir, Güver & Aslan 2006) for the determination of the total absorption for J band and colour excesses of (J − H) and (H − K s ) colours. All the magnitudes and colours with subscript "0" will be mentioned as de-reddened ones, hereafter.…”

Section: Intrinsic Colours and Absolute Magnitudesmentioning

confidence: 99%

New absolute magnitude calibrations for detached binaries

Bilir¹,

Ak²,

Soydugan³

et al. 2008

Astron Nachr

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Lutz-Kelker bias corrected absolute magnitude calibrations for the detached binary systems with main-sequence components are presented. The absolute magnitudes of the calibrator stars were derived at intrinsic colours of Johnson-Cousins and 2MASS (Two Micron All Sky Survey) photometric systems. As for the calibrator stars, 44 detached binaries were selected from the Hipparcos catalogue, which have relative observed parallax errors smaller than 15% ($\sigma_{\pi}/\pi\leq0.15$). The calibration equations which provide the corrected absolute magnitude for optical and near-infrared pass bands are valid for wide ranges of colours and absolute magnitudes: $-0.18<(B-V)_{0}<0.91$, $-1.6

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Section: Intrinsic Colours and Absolute Magnitudesmentioning

confidence: 99%

New absolute magnitude calibrations for detached binaries

Bilir¹,

Ak²,

Soydugan³

et al. 2008

Astron Nachr

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“…Thus, colours and magnitudes from the sample stars are dereddened by using the following two sets of equations, one for the BVI data () and one for the 2MASS () photometry: (see also Bilir, Güver & Aslan 2006a; Ak et al 2007).…”

Section: Data and Reductionsmentioning

confidence: 99%

Luminosity-colour relations for thin-disc main-sequence stars

Bilir

Karaali

et al. 2008

Monthly Notices of the Royal Astronomical Society

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In this study we present the absolute magnitude calibrations of thin‐disc main‐sequence stars in the optical , and in the near‐infrared . Thin‐disc stars are identified by means of Padova isochrones, and absolute magnitudes for the sample are evaluated via the newly reduced Hipparcos data. The obtained calibrations cover a large range of spectral types: from A0 to M4 in the optical and from A0 to M0 in the near‐infrared. Also, we discuss the effects of binary stars and evolved stars on the absolute magnitude calibrations. The usage of these calibrations can be extended to the estimation of galactic model parameters for the thin disc individually, in order to compare these parameters with the corresponding ones estimated by statistics (which provides galactic model parameters for thin and thick discs and halo simultaneously) to test any degeneracy between them. The calibrations can also be used in other astrophysical researches where distance plays an important role in that study.

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“…Bilir et al (2006aBilir et al ( , 2006b) presented linear Johnson JHK versus V -R relations that separate a typical dwarf star from a typical giant star in an infrared versus optical brightness diagram. Its calibration is based on a sample of stars with known VRJHK magnitudes and that had an entry in the log g catalogs of Cayrel et al (2001) and Ratnatunga & Freeman (1989).…”

Section: Optimum Star Density Per Square Degreementioning

confidence: 98%

Field optimization and CCD data simulation for the antarctic International Concordia Explorer Telescope (ICE‐T)

2009

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We performed extensive data simulations for the planned ultra-wide-field, high-precision photometric telescope ICE-T (International Concordia Explorer Telescope). ICE-T consists of two 60 cm-aperture Schmidt telescopes with a joint field of view simultaneously in two photometric bandpasses. Two CCD cameras, each with a single 10.3k×10.3k thinned backilluminated device, would image a sky field of 65 square degrees. Given a location of the telescope at Dome C on the East Antarctic Plateau, we searched for the star fields that best exploit the technical capabilities of the instrument and the site. We considered the effects of diurnal air mass and refraction variations, solar and lunar interference, interstellar absorption, overexposing of bright stars and ghosts, crowding by background stars, and the ratio of dwarf to giant stars in the field. Using NOMAD, SSA, Tycho-2 and 2MASS-based stellar positions and BV IJH magnitudes for these fields, we simulated the effects of the telescope's point-spread-function, the integration, and the co-addition times. Simulations of transit light curves are presented for the selected star fields and convolved with the expected instrumental characteristics. For the brightest stars, we showed that ICE-T should be capable of detecting a 2 R Earth Super Earth around a G2 solartype star, as well as an Earth around an M0-star -if these targets were as abundant as hot Jupiters. Simultaneously, the telescope would monitor the host star's surface activity in an astrophysically interpretable manner.

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Separation of dwarf and giant stars with ROTSE–IIId

Cited by 22 publications

References 17 publications

New absolute magnitude calibrations for detached binaries

New absolute magnitude calibrations for detached binaries

Luminosity-colour relations for thin-disc main-sequence stars

Field optimization and CCD data simulation for the antarctic International Concordia Explorer Telescope (ICE‐T)

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