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J/A+A/508/1313      Orion pre-main sequence RIJH light curves   (Frasca+, 2009)

REM near-IR and optical photometric monitoring of pre-main sequence stars in Orion. Rotation periods and starspot parameters. Frasca A., Covino E., Spezzi L., Alcala J.M., Marilli E., Furesz G., Gandolfi D. <Astron. Astrophys. 508, 1313 (2009)> =2009A&A...508.1313F
ADC_Keywords: Associations, stellar ; Stars, pre-main sequence ; Photometry, infrared Keywords: stars: pre-main sequence - stars: rotation - stars: starspots - stars: flare - techniques: photometric - ISM: individual objects: Orion Abstract: We performed an intensive photometric monitoring of the PMS stars falling in a field of about 10x10 arcminutes in the vicinity of the Orion Nebula Cluster (ONC). Photometric data were collected between November 2006 and January 2007 with the REM telescope in the VRIJHK' bands. The largest number of observations is in the I band (about 2700 images) and in J and H bands (about 500 images in each filter). From the observed rotational modulation, induced by the presence of surface inhomogeneities, we derived the rotation periods for 16 stars and improved previous determinations for the other 13. The analysis of the spectral energy distributions and, for some stars, of high-resolution spectra provided us with the main stellar parameters (luminosity, effective temperature, mass, age, and vsini). We also report the serendipitous detection of two strong flares in two of these objects. In most cases, the light-curve amplitudes decrease progressively from the R to H band as expected for cool starspots, while in a few cases, they can only be modelled by the presence of hot spots, presumably ascribable to magnetospheric accretion. The application of our own spot model to the simultaneous light curves in different bands allowed us to deduce the spot parameters and particularly to disentangle the spot temperature and size effects on the observed light curves. Description: The multiband (VRIJHK') photometry obtained with REM is presented in Table 6. For a few stars, IRAC photometry in mid-IR bands (3.6, 4.5, 5.8, and 8.0 micron) from Rebull et al. (2006, Cat. J/ApJ/646/297) is also listed. Table 7 lists the reference stars, along with their parameters, used for the spectral classification and the determination of effective temperature and projected rotational velocity (vsini) of the targets. The files Ori_starXX.R, Ori_starXX.I, Ori_starXX.J, Ori_starXX.H contain the photometric time series of the star XX in the R, I, J, and H bands that are displayed in Figs. 4 and 22 of the paper. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table6.dat 114 97 Standard VRIJHK' magnitudes table7.dat 40 101 Reference stars with Elodie spectra used for the spectral classification lc/* 39 110 Individual light curves
See also: J/ApJ/646/297 : Spitzer observations of pre-main-sequence stars (Rebull+, 2006) Byte-by-byte Description of file: table6.dat
Bytes Format Units Label Explanations
1- 2 I2 --- Seq Identifier of the source 4- 19 A16 --- 2MASS 2MASS Identifier 21- 25 F5.2 mag Vmag ?=- V magnitude 27- 30 F4.2 mag e_Vmag ?=- V magnitude error 32- 36 F5.2 mag Rmag ?=- R magnitude 38- 41 F4.2 mag e_Rmag ?=- R magnitude error 43- 47 F5.2 mag Imag ?=- I magnitude 49- 52 F4.2 mag e_Imag ?=- I magnitude error 54- 58 F5.2 mag Jmag J magnitude 60- 63 F4.2 mag e_Jmag J magnitude error 65- 69 F5.2 mag Hmag H magnitude 71- 74 F4.2 mag e_Hmag H magnitude error 76- 80 F5.2 mag Kmag K magnitude 82- 85 F4.2 mag e_Kmag K magnitude error 87- 91 F5.2 mag [3.6] ?=- IRAC 3.6-micron magnitude (1) 93- 97 F5.2 mag [4.5] ?=- IRAC 4.5-micron magnitude (1) 99-103 F5.2 mag [5.8] ?=- IRAC 5.8-micron magnitude (1) 105-109 F5.2 mag [8.0] ?=- IRAC 8.0-micron magnitude (1) 111-114 A4 --- LC Bands(s) with available light curves in subdirectory lc (2)
Note (1): From Rebull et al. (2006, Cat. J/ApJ/646/297) Note (2): File identified as Ori_starNN.B, where NN is the star number and B the band.
Byte-by-byte Description of file: table7.dat
Bytes Format Units Label Explanations
1- 12 A12 --- Name Star Name 15- 22 A8 --- SpType Spectral Type 25- 28 I4 K Teff Effective temperature 30- 34 F5.2 [cm2/s] logg ?=- Surface gravity 36- 40 F5.2 --- [Fe/H] ?=- Metallicity
Byte-by-byte Description of file (# headlines): lc/*
Bytes Format Units Label Explanations
6- 18 F13.5 d HJD Heliocentric Julian Day 23- 29 F7.4 mag mag R, I, J or H magnitude 34- 39 F6.4 mag e_mag Magnitude error
Acknowledgements: Antonio Frasca, antonio.frasca(at)oact.inaf.it
(End) Antonio Frasca [INAF-OACt, Italy], Patricia Vannier [CDS] 05-Nov-2009
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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