Metallicities of intermediate-age and old star clusters in the Large Magellanic Cloud

Kučinskas, A.; Dobrovolskas, V.; Černiauskas, A.; Lazauskaitė, Roma; Tanabé, Toshihiko

doi:10.1017/s1743921309991657

Cited by 7 publications

(7 citation statements)

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“…The SIRIUS filter system is unique so we transferred the measured instrumental magnitudes into the 2MASS system. The color terms of our transformations are identical, within the uncertainties, to those of (Kuchinskas et al 2008). A leastsquares fit to the transformations yielded an absolute photometric uncertainty below 3%.…”

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confidence: 67%

CHARACTERIZATION OF THE NEARBY L/T BINARY BROWN DWARF WISE J104915.57–531906.1 AT 2 pc FROM THE SUN

Kniazev

Vaïsänen

Mužić

et al. 2013

ApJ

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WISE J104915.57−531906.1 is a L/T brown dwarf binary located 2 pc from the Sun. The pair contains the closest known brown dwarfs and is the third closest known system, stellar or sub-stellar. We report comprehensive follow-up observations of this newly uncovered system. We have determined the spectral types of both components (L8±1, for the primary, agreeing with the discovery paper; T1.5±2 for the secondary, which was lacking spectroscopic type determination in the discovery paper) and, for the first time, their radial velocities (V rad ∼23.1, 19.5 km s −1 ) using optical spectra obtained at the Southern African Large Telescope (SALT) and other facilities located at the South African Astronomical Observatory (SAAO). The relative radial velocity of the two components is smaller than the range of orbital velocities for theoretically predicted masses, implying that they form a gravitationally bound system. We report resolved near-infrared JHK S photometry from the IRSF telescope at the SAAO which yields colors consistent with the spectroscopically derived spectral types. The available kinematic and photometric information excludes the possibility that the object belongs to any of the known nearby young moving groups or associations. Simultaneous optical polarimetry observations taken at the SAAO 1.9-m give a non-detection with an upper limit of 0.07%. For the given spectral types and absolute magnitudes, 1 Gyr theoretical models predict masses of 0.04-0.05 M ⊙ for the primary, and 0.03-0.05 M ⊙ for the secondary. Subject headings: brown dwarfs -infrared: stars -solar neighborhood -stars: low-mass -stars: individual (WISE J104915.57−531906.1, G 171−22, HD 55383) 1 Based on observations made with the Southern African Large Telescope (SALT).

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confidence: 67%

CHARACTERIZATION OF THE NEARBY L/T BINARY BROWN DWARF WISE J104915.57–531906.1 AT 2 pc FROM THE SUN

Kniazev

Vaïsänen

Mužić

et al. 2013

ApJ

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“…However, we note that the IRSF-SIRIUS filter-set was designed to match that of the Mauna Kea Observatories near-IR filters (Tokunaga et al 2002), and is therefore slightly different to that used by 2MASS. Transformation equations between the IRSF-SIRIUS and 2MASS systems are given by Kato et al (2007) and Kucinskas et al (2008); in practise, the corrections between the two are relatively small, with typical differences of less than 0.05 mag for (J − K s ) IRSF < 1.7 mag (Kucinskas et al 2008).…”

Section: Near-ir Photometrymentioning

confidence: 99%

The VLT-FLAMES Tarantula Survey

Evans

Taylor

Hénault-Brunet

et al. 2011

A&A

236

130

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The VLT-FLAMES Tarantula Survey (VFTS) is an ESO Large Programme that has obtained multi-epoch optical spectroscopy of over 800 massive stars in the 30 Doradus region of the Large Magellanic Cloud (LMC). Here we introduce our scientific motivations and give an overview of the survey targets, including optical and near-infrared photometry and comprehensive details of the data reduction. One of the principal objectives was to detect massive binary systems via variations in their radial velocities, thus shaping the multi-epoch observing strategy. Spectral classifications are given for the massive emission-line stars observed by the survey, including the discovery of a new Wolf-Rayet star (VFTS 682, classified as WN5h), 2 to the northeast of R136. To illustrate the diversity of objects encompassed by the survey, we investigate the spectral properties of sixteen targets identified by Gruendl & Chu from Spitzer photometry as candidate young stellar objects or stars with notable mid-infrared excesses. Detailed spectral classification and quantitative analysis of the O-and B-type stars in the VFTS sample, paying particular attention to the effects of rotational mixing and binarity, will be presented in a series of future articles to address fundamental questions in both stellar and cluster evolution.

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“…Compared to the contemporary DENIS (Cioni et al 2000) and 2MASS (Skrutskie et al 2006) catalogues, the IRSF catalogue is more than two magnitudes deeper at the K s band and about four times finer in spatial resolution. The IRSF system magnitudes were converted into the 2MASS system magnitudes by using the conversion equations given in Kato et al (2007) and Kučinskas et al (2008). Preferentially we have used IRSF photometry whenever available.…”

Section: Datamentioning

confidence: 99%

Period-magnitude relation of Mira-like variables in the Large Magellanic Cloud as a tool to understanding circumstellar extinction

Ita

Matsunaga

2011

Monthly Notices of the Royal Astronomical Society

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We derive the near-to mid-infrared period-magnitude relations and the period-bolometric luminosity relation of OGLE-III Mira-like variables in the Large Magellanic Cloud. The relations have a kink, and the period at which the break occurs is quantitatively obtained. There are many Mira-like variables whose fluxes at the optical and near-infrared wavebands are fainter than those predicted by the period-magnitude relations. The deviation is a result of the circumstellar extinction, and the amount of deviation is found to be strongly correlated with near-infrared colours. We derive the empirical formulae relating the amount of deviation and the near-infrared colours. These relations are useful to accurately calculate the distances to the dusty Mira-like variables, because the dimmed fluxes resulting from the circumstellar extinction can be estimated. In a manner analogous to the interstellar extinction law, the ratios of deviations at any two different wavebands are calculated. The ratios are found to change with the pulsation period, indicating that the dust properties are subject to change as Mira-like variables evolve.

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Metallicities of intermediate-age and old star clusters in the Large Magellanic Cloud

Cited by 7 publications

References 0 publications

CHARACTERIZATION OF THE NEARBY L/T BINARY BROWN DWARF WISE J104915.57–531906.1 AT 2 pc FROM THE SUN

CHARACTERIZATION OF THE NEARBY L/T BINARY BROWN DWARF WISE J104915.57–531906.1 AT 2 pc FROM THE SUN

The VLT-FLAMES Tarantula Survey

Period-magnitude relation of Mira-like variables in the Large Magellanic Cloud as a tool to understanding circumstellar extinction

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