Sacy — A Search for Associations Containing Young Stars

Torres, C. A. O.; Quast, G. R.; Reza, R. de la; Silva, Licio da; Melo, C. H. F.; Sterzik, M.

doi:10.1007/1-4020-2600-5_9

Cited by 25 publications

(49 citation statements)

References 14 publications

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“…It is assumed that the relevant results of earlier papers not on this list (e.g., de la Reza et al 1989;Kastner et al 1997;Webb et al 1999;Torres et al 2000Torres et al , 2003Song et al 2002) have been superceded by or included in the more recent papers on the NYMGs (Table 4).…”

Section: The Catalog Of Suspected Young Starsmentioning

confidence: 99%

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LACEwING: A New Moving Group Analysis Code

Riedel¹,

Blunt²,

Lambrides³

et al. 2017

102

148

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We present a new nearby young moving group (NYMG) kinematic membership analysis code, LocAting Constituent mEmbers In Nearby Groups (LACEwING), a new Catalog of Suspected Nearby Young Stars, a new list of bona fide members of moving groups, and a kinematic traceback code. LACEwING is a convergence-style algorithm with carefully vetted membership statistics based on a large numerical simulation of the Solar Neighborhood. Given spatial and kinematic information on stars, LACEwING calculates membership probabilities in 13 NYMGs and three open clusters within 100 pc. In addition to describing the inputs, methods, and products of the code, we provide comparisons of LACEwING to other popular kinematic moving group membership identification codes. As a proof of concept, we use LACEwING to reconsider the membership of 930 stellar systems in the Solar Neighborhood (within 100 pc) that have reported measurable lithium equivalent widths. We quantify the evidence in support of a population of young stars not attached to any NYMGs, which is a possible sign of new as-yet-undiscovered groups or of a field population of young stars.

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Section: The Catalog Of Suspected Young Starsmentioning

confidence: 99%

“…ABDor was first identified by Torres et al (2003) as "AnA" and by as ABDor (and possibly prediscovered by Asiain et al 1999 as subgroup B4.) ABDor has a space velocity distribution encompassing that of the Pleiades, and has been thought to be a product of the same star-forming event (Luhman et al 2005;Ortega et al 2007).…”

Section: Ab Dormentioning

confidence: 99%

LACEwING: A New Moving Group Analysis Code

Riedel¹,

Blunt²,

Lambrides³

et al. 2017

102

148

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show abstract

“…Since then, a dozen of young nearby associations have been identified (see reviews by Zuckermann & Song 2004;Torres et al 2003Torres et al , 2008. These associations are Based on observations collected with the UVES spectrograph at the VLT/UT2 8.2-m Kueyen Telescope (ESO run ID.…”

Section: Introductionmentioning

confidence: 99%

Search for associations containing young stars (SACY)

Almeida

Santos

Melo³

et al. 2009

A&A

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The recently discovered coeval, moving groups of young stellar objects in the solar neighborhood represent invaluable laboratories for studying recent star formation and searching for high metallicity stars that can be included in future exo-planet surveys. In this study, we derived through an uniform and homogeneous method stellar atmospheric parameters and abundances for iron, silicium, and nickel in 63 post-T Tauri stars from 11 nearby young associations. We further compare the results with two different pre-main sequence (PMS) and main sequence (MS) star populations. The stellar atmospheric parameters and the abundances presented here were derived using the equivalent width of individual lines in the stellar spectra by assuming the excitation/ionization equilibrium of iron. Moreover, we compared the observed Balmer lines with synthetic profiles calculated for model atmospheres with a different line-formation code. We found that the synthetic profiles agree reasonably well with the observed profiles, although the Balmer lines of many stars are substantially filled-in, probably by chromospheric emission. Solar metallicity is found to be a common trend in all the nearby young associations studied. The low abundance dispersion within each association strengthens the idea that the origin of these nearby young associations is related to the nearby star-forming regions (SFR). Abundances of elements other than iron are consistent with previous results for Main Sequence stars in the solar neighborhood. The chemical characterization of the members of the newly found nearby young associations, performed in this study and intended to proceed in subsequent works, is essential to understanding and testing the context of local star formation and the evolutionary history of the galaxy.

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“…The age of ABDMG is known to be between 50 and 120 Myr [6,7]. Since the statistical distance of a star given by the analysis has proven to be a very reliable measurement of the true distance (see Fig.…”

Section: The Companion and Its Host Starmentioning

confidence: 99%

A wide planetary-mass companion to a young M3 star of the AB Dor moving group

Naud

Artigau

Doyon

et al. 2013

EPJ Web of Conferences

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Abstract. We present a planetary-mass companion found 42 (2000 AU) from a M3 star, candidate member of the young (50-120 Myr) AB Doradus moving group. It was identified through an ongoing survey with GMOS at Gemini-South, via its distinctively red i-z color (>3.51). The comoving status of this object was confirmed by 2 epochs of WIRCam/CFHT J-band images. The NIR photometry and WISE colors suggest an early-to-mid T bound companion. A NIR spectrum, taken with GNIRS at Gemini-North, confirms a mid-T spectral type. With an estimated temperature between 900 K and 1200 K, models predict a mass between 7 and 12 M J up for this object. The benchmark character of this planetary-mass object lies in its relatively well-constrained age and in its very wide separation, that allows in-depth studies that can help validating models and understanding similar but closer-in companions such as the ones that will be uncovered by next-generation planet finders (e.g. GPI and SPHERE).

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Sacy — A Search for Associations Containing Young Stars

Cited by 25 publications

References 14 publications

LACEwING: A New Moving Group Analysis Code

LACEwING: A New Moving Group Analysis Code

Search for associations containing young stars (SACY)

A wide planetary-mass companion to a young M3 star of the AB Dor moving group

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