J/A+A/452/245 Near-IR photometry of PMS stars in rho Oph (Natta+, 2006)
Accretion in the ρ-Ophiuchi pre-main sequence stars.
Natta A., Testi L., Randich S.
<Astron. Astrophys., 452, 245-252 (2006)>
=2006A&A...452..245N 2006A&A...452..245N
ADC_Keywords: Stars, pre-main sequence ; Accretion ; Stars, masses ;
Effective temperatures ; Photometry, infrared ; Equivalent widths
Keywords: stars: formation - accretion, accretion disks - stars: activity
Abstract:
The aim of this paper is to provide a measurement of the mass
accretion rate in a large, complete sample of objects in the core of
the star forming region rho Oph.
The sample includes most of the objects (104 out of 111) with evidence
of a circumstellar disk from mid-infrared photometry; it covers a
stellar mass range from about 0.03 to 3M☉ and it is complete
to a limiting mass of ∼0.05M☉. We used J and K-band
spectra to derive the mass accretion rate of each object from the
intensity of the hydrogen recombination lines, Paβ or Brγ.
For comparison, we also obtained similar spectra of 35 diskless
objects.
Description:
Near infrared moderate resolution J and K band spectroscopic
observations of all targets in our sample were obtained at the ESO
Observatories in Chile. The objects were either observed using the
SofI instrument at the NTT 2.2m telescope (June 2004, Visitor Mode)
or the ISAAC instrument at the Antu 8.2m VLT unit telescope (Spring
2004, Service Mode).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tablec1.dat 138 105 Class II objects
tablec2.dat 132 35 Class III objects
tablec3.dat 81 5 Companions not resolved by 2MASS
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See also:
J/A+A/359/113 : X-ray and IR study of rho Oph dark cloud (Grosso+, 2000)
J/ApJS/112/109 : rho Oph Near IR Positions and Photometry (Barsony+, 1997)
J/A+A/372/173 : ISOCAM observations of the rho Ophiuchi cloud (Bontemps+ 2001)
Byte-by-byte Description of file: tablec1.dat tablec2.dat
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Bytes Format Unit s Label Explanations
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1- 3 I3 --- Seq [1/105] Sequential number (1)
5- 15 A11 --- --- [rho Oph-ISO]
17- 19 I3 --- ISO ISOCAM number from Bontemps et al.,
Cat. J/A+A/372/173 (G1)
20 A1 --- m_ISO [ab] Multiplicity index on ISO (G1)
21 A1 --- n_ISO [+*] Notes (2)
23- 24 I2 h RAh Right ascension (J2000.0)
26- 27 I2 min RAm Right ascension (J2000.0)
29- 33 F5.2 s RAs Right ascension (J2000.0)
35 A1 --- DE- Declination sign (J2000.0)
36- 37 I2 deg DEd Declination (J2000.0)
39- 40 I2 arcmin DEm Declination (J2000.0)
42- 46 F5.2 arcsec DEs Declination (J2000.0)
48- 52 F5.2 mag Jmag ?=0.00 2MASS J magnitude
54- 58 F5.2 mag Hmag ?=0.00 2MASS H magnitude
60- 64 F5.2 mag Kmag 2MASS K magnitude
66- 69 F4.1 mag AJ ? J-band extinction
71- 75 F5.2 [solLum] logL ? Stellar luminosity
77- 80 F4.2 [K] logTeff ? Effective temperature
82- 86 F5.2 [solMass] logM ? Stellar mass
88 A1 --- l_EWPa Limit flag on EWPa
89- 93 F5.1 0.1nm EWPa Paschenβ equivalent width
(negative values for emission lines)
95 A1 --- Inst [SI] Instrument SOFI/NTT or ISAAC/UT1
97 A1 --- l_LPa Limit flag on LPa
98-102 F5.2 solLum LPa ?=- Paschenβ luminosity
104 A1 --- l_Lacc Limit flag on Lacc
105-109 F5.2 solLum Lacc ?=- Accretion luminosity
111 A1 --- l_dM/dtacc Limit flag on dM/dtacc
112-117 F6.2 solMass/yr dM/dtacc ?=- Mass accretion
119-138 A20 --- ONames Other names
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Note (1): Sequential number by object type:
1-105 in tablec1, 1-35 in tablec2.
Note (2): Notes as follows:
+ = objects with a companion not resolved in the 2MASS photometry
* = For 97 rho Oph-ISO 059 (in tablec1), the JHK magnitudes and AJ,
logL logTeff and logM are those of object 32 rho Oph-ISO 047.
These data should not be taken into account.
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Byte-by-byte Description of file: tablec3.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 3 I3 --- Seq [1/5] Sequential number
5- 15 A11 --- --- [rho Oph-ISO]
17- 19 I3 --- ISO ISOCAM number from Bontemps et al.,
Cat. J/A+A/372/173 (G1)
20 A1 --- m_ISO [ab] Multiplicity index on ISO (G1)
23- 24 I2 h RAh Right ascension (J2000.0)
26- 27 I2 min RAm Right ascension (J2000.0)
29- 33 F5.2 s RAs Right ascension (J2000.0)
35 A1 --- DE- Declination sign (J2000.0)
36- 37 I2 deg DEd Declination (J2000.0)
39- 40 I2 arcmin DEm Declination (J2000.0)
42- 46 F5.2 arcsec DEs Declination (J2000.0)
48- 50 F3.1 arcsec Sep Separation
52 A1 --- l_EW Limit flag on EW
53- 56 F4.1 0.1nm EW Paschenβ or Brγ equivalent width
(negative values for emission lines)
58- 66 A9 --- Line Line of the equivalent width
68- 81 A14 --- ONames Other names
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Global notes:
Note (G1):
Objects identified as ISO-Oph NNNa in Simbad
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History:
* 18-Jun-2007: From electronic version of the journal
* 08-Jul-2008:
- in tablec1, positions corrected for objects
No. 13 (ISO 26), No. 97 (ISO 59), No. 102 (ISO 93)
No. 98 was cross-identified to ISO 170 instead of ISO 70
- in tablec3, No. 3 was cross-identified to ISO 170b instead of ISO 70b
(End) Patricia Vannier [CDS] 15-Jan-2007