J/AJ/133/2524 Spectra of young nearby stars (White+, 2007)
High-dispersion optical spectra of nearby stars younger than the Sun. White R.J., Gabor J.M., Hillenbrand L.A. <Astron. J., 133, 2524-2536 (2007)> =2007AJ....133.2524W
ADC_Keywords: Spectroscopy ; Stars, pre-main sequence ; YSOs ; Stars, nearby Keywords: stars: activity - stars: fundamental parameters stars: pre-main sequence Abstract: We present high-dispersion (R∼16000) optical (3900-8700Å) spectra of 390 stars obtained with the Palomar 60inch telescope. The majority of stars observed are part of the Spitzer Legacy Science Program "The Formation and Evolution of Planetary Systems." Through detailed analysis we determine stellar properties for this sample, including radial and rotational velocities, LiIλ6708 and Hα equivalent widths, the chromospheric activity index R'HK, and temperature- and gravity-sensitive line ratios. Several spectroscopic binaries are also identified. From our tabulations, we illustrate basic age- and rotation-related correlations among measured indices. One novel result is that CaII chromospheric emission appears to saturate at vsini values above ∼30km/s, similar to the well-established saturation of X-rays that originate in the spatially separate coronal region. Description: Spectroscopic observations were obtained on nine observing runs between 2001 July and 2003 June with the Palomar 60inch (1.5m) telescope and facility spectrograph in its echelle mode. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 206 474 Spectroscopic properties of observed single-lined stars table2.dat 111 11 Observed Double-Lined Binary Stars
See also: I/239 : The Hipparcos and Tycho Catalogues (ESA 1997) J/A+A/384/491 : Fast-rotating nearby solar-type stars. I (Cutispoto+, 2002-03) J/A+A/468/663 : Li abundances in solar-analog stars (Takeda+, 2007) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 6 A6 --- HD The HD identification number 8- 13 I6 --- HIP ? Hipparcos identification number 15- 37 A23 --- OName Other identification 39- 45 A7 --- Assoc Group source is associated with 47- 48 I2 h RAh Hour of Right Ascension (J2000) (G1) 50- 51 I2 min RAm Minute of Right Ascension (J2000) (G1) 53- 57 F5.2 s RAs Second of Right Ascension (J2000) (G1) 59 A1 --- DE- Sign of the Declination (J2000) (G1) 60- 61 I2 deg DEd Degree of Declination (J2000) (G1) 63- 64 I2 arcmin DEm Arcminute of Declination (J2000) (G1) 66- 69 F4.1 arcsec DEs Arcsecond of Declination (J2000) (G1) 71- 80 A10 "YYYY/MM/DD" ObsDate Date of the observation 82- 84 I3 --- SNR1 Signal-to-noise at [LiI] (6708Å) 86- 92 F7.2 0.1nm EWHa ?=8888 Hα equivalent width (1) 94 I1 --- u_EWLi [0/8] Flag on EWLi (2) 96-103 F8.3 0.1nm EWLi ?=8888 The [LiI] (6708Å) equivalent width (1) 105-110 F6.2 km/s RV ? Radial velocity 112-115 F4.2 km/s e_RV ? Error in RV 117-118 A2 --- u_vsini [018:] Flag on vsini (2) 120-126 F7.2 km/s vsini ? Projected rotational velocity (1) 128-132 F5.2 km/s e_vsini ? Error in vsini 134-138 I5 --- SNR2 ?=-99 Signal-to-noise at Ca H & K (3) 140-148 F9.3 --- S ?=-9999. Mount Wilson index of core emission 150-158 F9.3 --- e_S ?=-9999. Error in S 160-161 A2 --- u_S [e ok] Uncertain (e) or (ok) S value 163-175 A13 --- SpType Spectral type 176 A1 --- n_SpType [*] indicates a low surface gravity star 177-181 F5.2 mag B-V ?=-9.99 The (B-V) color index (5) 183-188 A6 --- r_B-V Reference of B-V (6) 190-196 F7.2 [-] RHK ?=99 Log of the chromospheric activity index (7) 198-202 F5.2 [-] e_RHK ?=99 Error of RHK (7) 204-206 A3 --- u_RHK [e,c] Uncertain RHK (8)
Note (1): 8888 means that the spectrum was corrupted and no equivalent width was measurable. Note (2): the flag qualifies a problem as follows: 0 = upper limit (<); 1 = no limit; 8 = Spectrum was corrupted; : = vsini value thought to be biased (see Section 4.2). Note (3): -9999 indicates no measurable value. Note (5): -9.99 indicates that no (B-V) color is available. Note (6): Reference as follows: Tycho = Tycho catalog (Cat. I/259); Tycho: = Tycho catalog, with a large B-V error (>0.1mag); SpT = B-V estimated from stellar spectral type; x = no (B-V) color available. Note (7): Values of "9999" and "99" in RHK and e_RHK indicate no measurable RHK or error. Note (8): Quality as follows: e = has an uncertain S value. c = (B-V) colors are outside the range over which R'HK values are calibrated.
Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 6 I6 --- HD ? The HD identification number 8- 13 I6 --- HIP ? The Hipparcos identification number 15- 31 A17 --- OName Other name 33- 39 A7 --- Assoc Group source is associated with 45- 46 I2 h RAh ? Hour of Right Ascension (J2000) (G1) 48- 49 I2 min RAm ? Minute of Right Ascension (J2000) (G1) 51- 55 F5.2 s RAs ? Second of Right Ascension (J2000) (G1) 57 A1 --- DE- Sign of the Declination (J2000) (G1) 58- 59 I2 deg DEd ? Degree of Declination (J2000) (G1) 61- 62 I2 arcmin DEm ? Arcminute of Declination (J2000) (G1) 64- 68 F5.2 arcsec DEs ? Arcsecond of Declination (J2000) (G1) 70- 79 A10 "YYYY/MM/DD" Obs.Date Date of the observation 81- 83 I3 --- SNR Signal-to-noise ratio at [LiI] (6708Å) 85- 87 I3 0.1pm Li.1 ? LiI(6708Å) equivalent width of primary 88 A1 --- --- [/] 89- 91 I3 0.1pm Li.2 ? LiI(6708Å) equivalent width, secondary 93- 95 I3 0.1pm Ca.1 ? CaI(6717Å) equivalent width of primary 96 A1 --- --- [/] 97- 99 I3 0.1pm Ca.2 ? CaI(6717Å) equivalent width, secondary 101-105 F5.2 0.1nm Ha.1 ? Hα equivalent width of primary 106 A1 --- n_Ha.1 [/e] 'e' for emission 107-111 F5.2 0.1nm Ha.2 ? Hα equivalent width, secondary
Global notes: Note (G1): Coordinates for all stars are from the 2MASS All-Sky Catalog of Point Sources (Cutri et al. 2003, Cat. II/246), as interpreted by VizieR (Ochsenbein et al., 2000A&AS..143...23O).
History: From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 06-May-2009
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