Search for associations containing young stars (SACY)

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

doi:10.1051/0004-6361:20065602

Cited by 615 publications

(1,011 citation statements)

References 62 publications

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“…5) with respect to the Local Standard of Rest (LSR). We developed a code that uses equations of Johnson & Soderblom (1987), parallaxes and proper motions both from the new reduction of the Hipparcos data, and radial velocities from Holmberg et al (2007), Torres et al (2006) for HD 114613, and Santos et al (2004) for HD 160691. For the Sun, the adopted values of U LSR , V LSR , and W LSR are 10.0, 5.3, and 7.2 km s −1 , respectively (Dehnen & Binney 1998).…”

Section: Galactic Velocities Distance and Eccentricitymentioning

confidence: 99%

Accurate and homogeneous abundance patterns in solar-type stars of the solar neighbourhood: a chemo-chronological analysis

Silva

Mello

Milone

et al. 2012

A&A

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Aims. We report the derivation of abundances of C, Na, Mg, Si, Ca, Sc, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Sr, Y, Zr, Ba, Ce, Nd, and Sm in a sample of 25 solar-type stars of the solar neighbourhood, correlating the abundances with the stellar ages, kinematics, and orbital parameters. Methods. The spectroscopic analysis, based on data of high resolution and high signal-to-noise ratio, was differential to the Sun and applied to atomic line equivalent widths supplemented by the spectral synthesis of C and C 2 features. We also performed a statistical study by using the method of tree clustering analysis, searching for groups of stars sharing similar elemental abundance patterns. We derived the stellar parameters from various criteria, with average errors of 30 K, 0.13 dex, and 0.05 dex, respectively, for T eff , log g, and [Fe/H]. The average error of the [X/Fe] abundance ratios is 0.06 dex. Ages were derived from theoretical HR diagrams and membership of the stars in known kinematical moving groups.

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Section: Galactic Velocities Distance and Eccentricitymentioning

confidence: 99%

Accurate and homogeneous abundance patterns in solar-type stars of the solar neighbourhood: a chemo-chronological analysis

Silva

Mello

Milone

et al. 2012

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“…The analysis of the optical spectrum of HIP 96515 A obtained during the SACY survey, allowed Torres et al (2006) to classify the object as an SB2 with almost equal-mass components (see Table 3). From the cross-correlation function (CFF), we estimated a magnitude difference of Δ V = 0.55 mag between the binary components.…”

Section: Observational Properties Of Hip 96515 Aandbmentioning

confidence: 99%

“…In 2006, we started an infrared survey to detect substellar objects around young stars from the SACY catalog (Torres et al 2003(Torres et al , 2006. Our sample included HIP 96515, a nearby (d = 43.9 ± 9 pc, van Leeuwen 2007) M1-type star classified as a double-lined spectroscopic binary (SB2) by Torres et al (2006).…”

Section: Introductionmentioning

confidence: 99%

“…Our sample included HIP 96515, a nearby (d = 43.9 ± 9 pc, van Leeuwen 2007) M1-type star classified as a double-lined spectroscopic binary (SB2) by Torres et al (2006). Marie Curie Outgoing International Fellow.…”

Section: Introductionmentioning

confidence: 99%

“…In Sect. 3, we analyze spectroscopic Torres et al (2006). Torres et al (2006); 2 2MASS catalog (Cutri et al 2003); 3 Visual Double stars in Hipparcos catalog (Dommanget & Nys 2000); 4 UCAC2 catalog; 5 NACO/VLT data (this work).…”

Section: Introductionmentioning

confidence: 99%

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The triple system HIP 96515: a low-mass eclipsing binary with a DB white dwarf companion

Huélamo¹,

Vaz

Torres

et al. 2009

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Context. HIP 96515 A is a double-lined spectroscopic binary included in the SACY catalog as a potential young star. It has a visual companion (CCDM 19371-5134 B, HIP 96515 B) at 8. 6. If bound to the primary, the optical and infrared colors of this wide companion are consistent with those of a white dwarf. Aims. We attempt to characterize the system HIP 96515 A&B by studying each of its components. Methods. We analyzed spectroscopic and photometric observations of HIP 96515 A and its visual companion, HIP 96515 B. To confirm the system as a common proper-motion pair, we analyzed the astrometry of the components using high-angular resolution infrared observations obtained within a time span of two years, and archival astrometry. Results. The high-resolution optical spectrum of HIP 96515 A was used to derive a mass ratio, M 2 /M 1 , close to 0.9. The optical lightcurve of HIP 96515 A shows periodic variations with P orbital = 2.3456 days, revealing that HIP 96515 A is an eclipsing binary with preliminary orbital parameters of i = 89.• 0 ± 0.• 2, and M 1 = 0.59 ± 0.03 M and M 2 = 0.54 ± 0.03 M , for the primary and secondary, respectively, at an estimated distance of 42 ± 3 pc. This is a new eclipsing binary with component masses below 0.6 M . Multi-epoch observations of HIP 96515 A&B show that the system is a common proper-motion pair. The optical spectrum of HIP 96515 B is consistent with a pure helium atmosphere (DB) white dwarf. The comparison with evolutionary cooling sequence models provides T eff,WD = 19 126 ± 195 K, log g WD = 8.08, M WD /M = 0.6, and a distance of ∼46 pc. The estimated WD cooling age is ∼100 Myr and the total age of the object (including the main-sequence phase) is ∼400 Myr. Finally, if HIP 96515 A&B are coeval, and assuming a common age of ∼400 Myr, the comparison of the masses of the eclipsing binary members with evolutionary tracks shows that they are underestimated by ∼15% and 10%, for the primary and secondary, respectively.

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An X‐shooter survey of star forming regions: Low‐mass stars and sub‐stellar objects

et al. 2011

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We present preliminary results of our X-shooter survey in star forming regions. In this contribution we focus on subsamples of young stellar and sub-stellar objects (YSOs) in the Lupus star forming region and in the TW Hya association. We show that the X-shooter spectra are suitable for conducting several parallel studies such as YSO + disk fundamental parameters, accretion and outflow activity in the very low-mass (VLM) and sub-stellar regimes, as well as magnetic activity in young VLM YSOs, and Li abundance determinations. The capabilities of X-shooter in terms of wide spectral coverage, resolution and limiting magnitudes, allow us to assess simultaneously the accretion/outflow, magnetic activity, and disk diagnostics, from the UV and optical to the near-IR, avoiding ambiguities due to possible YSO variability.

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Search for associations containing young stars (SACY)

Cited by 615 publications

References 62 publications

Accurate and homogeneous abundance patterns in solar-type stars of the solar neighbourhood: a chemo-chronological analysis

Accurate and homogeneous abundance patterns in solar-type stars of the solar neighbourhood: a chemo-chronological analysis

The triple system HIP 96515: a low-mass eclipsing binary with a DB white dwarf companion

An X‐shooter survey of star forming regions: Low‐mass stars and sub‐stellar objects

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