J/A+A/568/A119 Stellar physical parameters for young stars (Monguio+, 2014)
Stellar physical parameters from Strmgren photometry.
Application to the young stars in the Galactic anticenter survey.
Monguio M., Figueras F., Grosbol P.
<Astron. Astrophys. 568, A119 (2014)>
=2014A&A...568A.119M 2014A&A...568A.119M
ADC_Keywords: Stars, early-type ; Stars, distances ; Photometry, uvby, beta ;
Effective temperatures
Keywords: methods: observational - techniques: photometric - catalogs -
Galaxy: stellar content - Galaxy: structure
Description:
A uvbyHβ Stromgren photometric survey covering 16 square degrees
in the anticenter direction was carried out using the Wide Field
Camera at the Isaac Newton Telescope. Physical parameters like stellar
distances and extinctions for the young stars of our survey are
presented here.
We developed a new method for deriving physical parameters from
Stromgren photometry and also implemented and tested it. This is a
model-based method that uses the most recent available stellar
atmospheric models and evolutionary tracks to interpolate in a 3D grid
of the unreddened indexes [m1], [c1] and Hβ. Distances derived from
both this method and the classical pre-Hipparcos calibrations were
tested against Hipparcos parallaxes and found to be accurate.
Furthermore, a shift in the atmospheric grids in the range
Teff=[7000,9000]K was detected and a correction is proposed. The two
methods were used to compute distances and reddening for around 12000
OBA-type stars in our Stromgren anticenter survey. Data from the IPHAS
and 2MASS catalogs were used to complement the detection of emission
line stars and to break the degeneracy between early and late
photometric regions. We note that photometric distances can differ by
more than 20%, those derived from the empirical calibrations being
smaller than those derived with the new method, which agree better
with the Hipparcos data.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
spp.dat 419 13687 Catalog of physical parameters of young stars
in the Galactic anticenter survey
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See also:
I/239 : The Hipparcos and Tycho Catalogues (ESA 1997)
Byte-by-byte Description of file: spp.dat
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Bytes Format Units Label Explanations
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1- 5 I5 --- ID [1/70989] Star ID number
7- 16 F10.7 deg RAdeg Right ascension (J2000.0)
18- 27 F10.7 deg DEdeg Declination (J2000.0)
29- 34 F6.3 mag Vmag Magnitude transformed into the standard
Johnson V magnitude
36- 41 F6.3 mag e_Vmag Error of Vmag
43- 48 F6.3 mag (b-y) Stromgren (b-y) color index
50- 55 F6.3 mag e_(b-y) Error of (b-y)
57- 62 F6.3 mag c1 Stromgren c1 index
64- 69 F6.3 mag e_c1 Error of c1
71- 76 F6.3 mag m1 Stromgren m1 index
78- 83 F6.3 mag e_m1 Error of m1
85- 90 F6.3 mag Hbet New values for the Stromgren Hβ index
92- 97 F6.3 mag e_Hbet Error of Hbet
99-104 I6 pc r ?=999999 MB distance (3)
106-111 I6 pc e_r ?=999999 Error of r
113-117 F5.2 mag (b-y)0 MB intrinsic color (b-y)0 (3)
119-123 F5.2 mag e_(b-y)0 ?=99.99 Error of (b-y)0
125-129 F5.2 mag vMAG ?=99.99 MB absolute magnitude (3)
131-135 F5.2 mag e_vMAG ?=99.99 Error of vMAG
137-141 F5.2 mag Av ?=99.99 MB visual absorption (3)
143-147 F5.2 mag e_Av ?=99.99 Error of Av
149-154 I6 K Teff MB effective temperature (3)
156-161 I6 K e_Teff ?=999999 Error of Teff
163-167 F5.2 --- logg MB surface gravity (3)
169-173 F5.2 --- e_logg ?=99.99 Error of logg
175-179 F5.2 Lsun Lum ?=99.99 MB luminosity (3)
181-185 F5.2 Lsun e_Lum ?=99.99 Error of lum
187-191 F5.2 [yr] logAge MB log(Age) (3)
193-197 F5.2 [yr] e_logAge ?=99.99 Error of logAge
199-203 F5.2 Msun Mass ?=99.99 MB stellar mass (3)
205-209 F5.2 Msun e_Mass ?=99.99 Error of Mass
211-216 F6.3 mag BC MB bolometric correction (3)
218-223 F6.3 mag e_BC ?=99.99 Error of BC
225-229 F5.3 mag DSE Dse: 3D fitting parameter providing the
distance between the star and the ellipsoid
of errors in the [m1]-[c1]-Hβ space
231-235 F5.3 mag DSG 3D fitting parameter providing the distance
between the star and the point if the grid in
the [m1]-[c1]-Hβ space
237-241 F5.3 --- Pmax [0/1] Parameter indicating the probability for
the star to belong to the most probable point
of the grid
243-247 F5.3 --- PmaxB [0/1] Parameter indicating the probability for
the star to belong to the corresponding point
of the grid at the other side of the gap
249-251 I3 % Nside [0/100] Percentage of simulated stars located
at the corresponding side of the gap (1)
253-258 I6 pc rEC ?=999999 EC distance (3)
260-265 I6 pc e_rEC ?=999999 Error of r_EC
267-271 F5.2 mag (b-y)0EC ?=99.99 EC intrinsic color (b-y)0 (3)
273-277 F5.2 mag e_(b-y)0EC ?=99.99 Error of (b-y)0_EC
279-284 F6.2 mag vMAGEC ?=99.99 EC absolute magnitude (3)
286-291 F6.2 mag e_vMAGEC ?=99.99 Error of Mv_EC
293-297 F5.2 mag AvEC ?=99.99 EC visual absorption (3)
299-303 F5.2 mag e_AvEC ?=99.99 Error of Av EC
305 I1 --- reg [1/5] Photometric region assigned to the star
by the new classification (NC) method
307-309 I3 % Nreg1 [0/100] Percentage of simulated stars located
in the early region (up to B9)
311-313 I3 % Nreg2 [0/100] Percentage of simulated stars located
in the intermediate region (A0-A3)
315-317 I3 % Nreg3 [0/100] Percentage of simulated stars located
in the late region (up to A9)
319-321 I3 % Nreg4 [0/100] Percentage of simulated stars located
in the late region (F0-G2)
323-325 I3 % Nreg5 [0/100] Percentage of simulated stars located
in the late region (later than G2)
327-332 I6 pc rB ?=999999 MB(B) distance (3)
334-338 F5.2 mag (b-y)0B MB(B) (b-y)0 intrinsic color (3)
340-344 F5.2 mag MvB ?=99.99 MB(B) absolute magnitude (3)
346-350 F5.2 mag AvB MB(B) visual absorption (3)
352-356 I5 K TeffB MB(B) effective temperature (3)
358-362 F5.2 --- loggB MB(B) surface gravity (3)
364-368 F5.2 Lsun lumB ?=99.99 MB(B) luminosity (3)
370-374 F5.2 [yr] logAgeB MB(B) log(Age) (3)
376-380 F5.2 Msun MassB MB(B) stellar mass (3)
382-387 F6.3 mag BCB MB(B) bolometric correction (3)
389 I1 --- em [0/2] Flag indicating emission-line stars (=1)
according to IPHAS data (2)
391-396 F6.3 mag DJKmin ?=99.999 Minimum distance between the location
of the star in the (J-K)0 vs. (b-y)0 plot
and the main sequence relation (MB method)
398-403 F6.3 mag DKHin ?=99.999 Minimum distance between the location
of the star in the (J-H)0 vs. (b-y)0 plot
and the main sequence relation (MB method)
405-411 F7.3 mag FlagJK ?=999.999 FlagJK = DJK,B,min-DJK,min
comparing both assignations with 2MASS data
413-419 F7.3 mag FlagJH ?=999.999 FlagJH = DJH,B,min-DJH,min
comparing both assignations with 2MASS data
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Note (1): The limit between sides of the gap is empirically set at 10000K.
Note (2): Flag as follows:
0 = it is not an emission line star
1 = it is an emission line star
2 = IPHAS information is not available
Note (3): Parameters are derived using 2 models:
MB = model-based method using theoretical atmospheric grids and stellar
evolution models
MB(B) = model-based method, where parameters forced to be at the
other side of the [c1]-[m1] gap
EC = empirical calibrations (photometric distances derived from a
comparison with Hipparcos parallaxes)
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Acknowledgements:
Maria Monguio, mmonguio(at)am.ub.es
(End) Maria Monguio [IEEC-ICC-UB], Patricia Vannier [CDS] 28-Aug-2014