J/ApJ/794/125 IN-SYNC. I. APOGEE stellar parameters (Cottaar+, 2014)
IN-SYNC I: homogeneous stellar parameters from high-resolution APOGEE spectra for thousands of pre-main sequence stars. Cottaar M., Covey K.R., Meyer M.R., Nidever D.L., Stassun K.G., Foster J.B., Tan J.C., Chojnowski S.D., da Rio N., Flaherty K.M., Frinchaboy P.M., Skrutskie M., Majewski S.R., Wilson J.C., Zasowski G. <Astrophys. J., 794, 125 (2014)> =2014ApJ...794..125C 2014ApJ...794..125C
ADC_Keywords: Clusters, open ; Spectra, infrared ; Rotational velocities ; Effective temperatures ; YSOs Keywords: open clusters and associations: IC 348, Pleiades; stars: pre-main sequence; techniques: radial velocities; techniques: spectroscopic Abstract: Over two years, 8859 high-resolution H-band spectra of 3493 young (1-10Myr) stars were gathered by the multi-object spectrograph of the APOGEE project as part of the IN-SYNC ancillary program of the SDSS-III survey. Here we present the forward modeling approach used to derive effective temperatures, surface gravities, radial velocities, rotational velocities, and H-band veiling from these near-infrared spectra. We discuss in detail the statistical and systematic uncertainties in these stellar parameters. In addition, we present accurate extinctions by measuring the E(J-H) of these young stars with respect to the single-star photometric locus in the Pleiades. Finally, we identify an intrinsic stellar radius spread of about 25% for late-type stars in IC 348 using three (nearly) independent measures of stellar radius, namely, the extinction-corrected J-band magnitude, the surface gravity, and the Rsini from the rotational velocities and literature rotation periods. We exclude that this spread is caused by uncertainties in the stellar parameters by showing that the three estimators of stellar radius are correlated, so that brighter stars tend to have lower surface gravities and larger Rsini than fainter stars at the same effective temperature. Description: The spectra were collected with APOGEE's multi-object, high-resolution (R∼22500) spectrograph with a spectral range covering much of the H band from 1.51 to 1.69um, which is fiber-fed from the Sloan 2.5m telescope. We provide two companion tables to this paper, which contain the derived stellar parameters for the stars in IC 348 and the Pleiades. The first table contains one row per star with the mean spectral and photometric parameters. The second table contains one row per epoch with the spectral parameters measured at that epoch. In both tables we provide the uncertainties computed by Equation (5). File Summary: -------------------------------------------------------------------------------- FileName Lrecl Records Explanations -------------------------------------------------------------------------------- ReadMe 80 . This file stars.dat 172 607 Derived stellar parameters in IC 348 and the Pleiades for each star epochs.dat 118 3003 Derived stellar parameters in IC 348 and the Pleiades per epoch for 607 stars -------------------------------------------------------------------------------- See also: II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003) J/ApJ/799/136 : IN-SYNC. II. Cand. young stars in NGC 1333 (Foster+, 2015) J/A+A/573/A90 : STAGGER-grid of 3D stellar models. IV. (Magic+, 2015) J/AJ/148/30 : BVI photometry of 350 Pleiades stars (Kamai+, 2014) J/MNRAS/437/906 : Cl* IC 348 H 254 VRI light curves (Ripepi+, 2014) J/ApJ/779/188 : Spectra of nearby late K and M Kepler stars (Mann+, 2013) J/AJ/146/133 : Stellar data from SDSS-III APOGEE DR10 (Meszaros+, 2013) J/AJ/145/66 : Spitzer light curves of YSOs in IC 348 (Flaherty+, 2013) J/MNRAS/434/806 : Pre-main-sequence isochrones. II. SFR (Bell+, 2013) J/MNRAS/424/3178 : PMS isochrones. Pleiades benchmark (Bell+, 2012) J/A+A/539/A64 : X-ray data for IC 348 young stars (Alexander+, 2012) J/ApJ/723/684 : NIRSPEC ultracool dwarf RV survey (Blake+, 2010) J/MNRAS/408/475 : HATNet Pleiades Rotation Period Catalogue (Hartman+, 2010) J/AJ/138/703 : Deep MIPS observations of IC 348 nebula (Currie+, 2009) J/A+A/498/949 : F-K dwarfs velocities in open clusters (Mermilliod+, 2009) J/A+A/478/507 : Distances & atmospheric param. of MSU stars (Morales+, 2008) J/AJ/134/411 : Properties of IC 348 members (Muench+, 2007) J/ApJ/649/862 : IR phot. of IC 348 pre-main-sequence stars (Cieza+, 2006) J/MNRAS/358/341 : Ic photometry of IC 348 (Littlefair+, 2005) J/AJ/127/1602 : Cousins RI photometry in IC 348 (Cohen+, 2004) J/ApJ/593/1093 : IC 348 membership (Luhman+, 2003) J/ApJ/541/977 : HST observations of low-mass stars in IC 348 (Najita+, 2000) J/ApJ/525/466 : Young low-mass stars & BD* in IC 348 (Luhman+, 1999) J/ApJ/497/736 : The young cluster IC 348. (Herbig, 1998) J/A+A/335/183 : Pleiades low-mass stars rotational velocities (Queloz+ 1998) J/A+A/332/575 : Pleiades member list (Belikov+ 1998) J/ApJS/85/315 : F, G and K dwarf stars of the Pleiades (Soderblom+ 1993) http://www.sdss3.org/ : SDSS-III home page Byte-by-byte Description of file: stars.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 2 A2 --- --- [2M] 3- 18 A16 --- 2MASS 2MASS identifier (HHMMSSss+DDMMSSs; J2000) 20- 27 F8.5 deg RAdeg Right ascension in decimal degrees (J2000) 29- 36 F8.5 deg DEdeg Declination in decimal degrees (J2000) 38- 45 A8 --- Cluster Cluster name ("Pleiades" or "IC 348") 47- 48 I2 --- Nep [1/13] Number of epochs 50- 55 F6.2 d Dt [0/507] Total baseline: max(Epoch)-min(Epoch) 57- 62 F6.1 --- S/N [-0/1330] S/N of co-added spectrum 64- 67 I4 K Teff [400/7000] Weighted mean of the effective temperature 69- 71 I3 K e_Teff [0/956] Teff uncertainty 73- 77 F5.3 --- pTeff [0/1]? probability of constant Teff (1) 79- 83 F5.2 [cm/s2] logg [-0.5/5.5] Weighted mean of the logarithm surface gravity 85- 88 F4.2 [cm/s2] e_logg [0/2] logg uncertainty 90- 94 F5.3 --- plogg [0/1]? probability of constant logg (1) 96-101 F6.2 km/s vsini [0.02/585] Weighted mean of the projected rotation velocity 103-108 F6.2 km/s e_vsini [0.03/264] vsini uncertainty 110-114 F5.3 --- pvsini [0/1]? probability of constant vsin(i) (1) 116-121 F6.4 --- RH [0/2.6] Weighted mean of the veiling (RH) 123-128 F6.4 --- e_RH [0/1.1] RH uncertainty 130-134 F5.3 --- pRH [0/1]? probability of constant RH (1) 136-141 F6.3 mag Jmag [0/17.4]?=99.999 2MASS J band magnitude 143-148 F6.3 mag Hmag [6.6/15] 2MASS H band magnitude 150-155 F6.3 mag Ksmag [0/14.6]?=99.999 2MASS Ks band magnitude 158-163 F6.3 mag E(J-H) [-0.4/2.7]?=99.999 J-H color excess (2) 167-172 F6.3 mag Jmag0 [6.3/15.6]?=99.999 Extinction-corrected apparent J magnitude (2) -------------------------------------------------------------------------------- Note (1): Probability that the stellar parameter is consistent with being constant, as estimated from the p-value that the χ2 [Σ(pi-µ)2/σi2] is larger than expected from chance, where pi is the measured parameter with uncertainty σi in epoch i and µ is the weighted mean over all epochs. Note (2): original "impossible" values, resulting from Jmag values set to 99.999 and used as valid numbers, were set to 99.999 at CDS. -------------------------------------------------------------------------------- Byte-by-byte Description of file: epochs.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 2 A2 --- --- [2M] 3- 18 A16 --- 2MASS 2MASS identifier (HHMMSSss+DDMMSSs; J2000) 20- 28 F9.1 d JD Date of the observation 30- 34 F5.1 --- S/N [-0/689] Signal to noise ratio 36- 39 I4 K Teff [400/7000] Effective temperature 41- 44 I4 K e_Teff [0/7416] Teff uncertainty 46- 50 I5 --- oTeff [-1210/2133]? η-offset of Teff (1) 52- 56 F5.2 [cm/s2] logg [-0.5/5.5] Surface gravity 58- 61 F4.2 [cm/s2] e_logg [0/6.7] logg uncertainty 63- 69 F7.1 --- ologg [-1989/1923]? η-offset of logg (1) 71- 77 F7.2 km/s vsini [0.01/2683] Rotational velocity 79- 85 F7.2 km/s e_vsini [0.04/8295] vsini uncertainty 87- 92 F6.1 --- ovsini ? η-offset of vsini (1) 94-100 F7.4 --- RH [0/43.1] H-band veiling (RH) 102-110 F9.4 --- e_RH [0/3656] RH uncertainty 112-118 F7.3 --- oRH [-35/25]? η-offset of RH (1) -------------------------------------------------------------------------------- Note (1): The normalized offset ηi et epoch i of the parameter p is computed with Eq.(2): ηi = (pi-)/sqrt(σi2 + σp2), where pi = observed stellar parameter σi = uncertainty of p at epoch i
= weighted mean of p over all other epochs (excluding i) σp = uncertainty of
over all other epochs (excluding i) -------------------------------------------------------------------------------- History: From electronic version of the journal References: Foster et al. Paper II. 2015ApJ...799..136F 2015ApJ...799..136F Cat. J/ApJ/799/136 Cottaar et al. Paper III. 2015ApJ...807...27C 2015ApJ...807...27C Cat. J/ApJ/807/27 Da Rio et al. Paper IV. 2016ApJ...818...59D 2016ApJ...818...59D Cat. J/ApJ/818/59
(End) Emmanuelle Perret [CDS] 16-Jun-2015
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