J/A+A/585/A7 Hyades single stars fiducial photometry (Kopytova+, 2016)
Single stars in the Hyades open cluster. Fiducial sequence for testing stellar
and atmospheric models.
Kopytova T.G., Brandner W., Tognelli E., Prada Moroni P.G., Da Rio N.,
Roeser S., Schilbach E.
<Astron. Astrophys. 585, A7 (2016)>
=2016A&A...585A...7K 2016A&A...585A...7K (SIMBAD/NED BibCode)
ADC_Keywords: Clusters, open ; Photometry, infrared ; Photometry, ultraviolet
Keywords: stars: general -
open clusters and associations: individual: the Hyades -
stars: fundamental parameters - stars: atmospheres -
binaries: general - techniques: high angular resolution
Abstract:
Age and mass determinations for isolated stellar objects remain
model-dependent. While stellar interior and atmospheric theoretical
models are rapidly evolving, we need a powerful tool to test them.
Open clusters are good candidates for this role.
We aim to create a fiducial sequence of stellar objects for testing
stellar and atmospheric models.
We complement previous studies on the Hyades multiplicity by Lucky
Imaging observations with the AstraLux Norte camera. This allows us to
exclude possible binary and multiple systems with companions outside
2-7AU separation and to create a "single-star sequence" for the
Hyades. The sequence encompasses 250 main-sequence stars ranging from
A5V to M6V. Using the "Tool for Astrophysical Data Analysis" (TA-DA),
we create various theoretical isochrones applying different
combinations of interior and atmospheric models. We compare the
isochrones with the observed Hyades single-star sequence on J vs.
J-Ks, J vs. J-H and Ks vs. H-Ks color-magnitude diagrams. As a
reference we also compute absolute fluxes and magnitudes for all stars
from X-ray to mid-infrared based on photometric measurements available
in the literature (ROSAT X-ray, GALEX UV, APASS gri, 2MASS JHKs, and
WISE W1 to W4).
We find that combinations of both PISA and DARTMOUTH stellar interior
models with BT-Settl 2010 atmospheric models describe the observed
sequence well. We use PISA in combination with BT-Settl 2010 models to
derive theoretical predictions for physical parameters (Teff, mass,
logg) of 250 single stars in the Hyades. The full sequence covers the
mass range 0.13 to 2.3M☉, and effective temperatures between
3060K and 8200K. Conclusions. Within the measurement uncertainties,
the current generation of models agree well with the single-star
sequence. The primary limitations are the uncertainties in the
measurement of the distance to individual Hyades members, and
uncertainties in the photometry. Gaia parallaxes, photometry and
spectroscopy will greatly reduce the uncertainties in particular at
the lowest mass range, and will enable us to test model predictions
with greater confidence. Additionally, a small (∼0.05mag) systematic
offset can be noted on J vs. J-K and K vs. H-K diagrams - the observed
sequence is shifted to redder colors from the theoretical predictions.
Description:
Absolute photometry (ROSAT X-ray, GALEX UV, APASS gri, 2MASS JHKs, and
WISE W1 to W4) and physical parameters of the Hyades single-star
sequence members. The "Resolution" column correspond to values outside
which no companion was detected. Objects observed only by the
spectroscopic survey of Mermilliod et al. (2009A&A...498..949M 2009A&A...498..949M, Cat.
J/A+A/498/949) have no resolution value. Hyades IDs are from Roeser et
al. (2011A&A...531A..92R 2011A&A...531A..92R, Cat. J/A+A/531/A92).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 313 250 Absolute JHKs (2MASS) photometry and physical
parameters of the Hyades single-star sequence
members
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See also:
I/280 : All-Sky Compiled Cat. of 2.5 million stars (Kharchenko+ 2009)
VII/233 : The 2MASS Extended sources (IPAC/UMass, 2003-2006)
J/ApJ/448/683 : Hyades RASS observations (Stern+ 1995)
J/A+A/498/949 : 1253 F-K dwarfs in open clusters velocities (Mermilliod+, 2009)
J/A+A/531/A92 : Deep all-sky census of the Hyades (Roeser+, 2011)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- ID Hyades ID from Roeser et al.
(2011, Cat. J/A+A/531/A92)
6- 17 F12.8 deg RAdeg Right ascension (J2000.0)
20- 31 F12.8 deg DEdeg Declination (J2000.0)
33- 39 F7.3 mas plx Parallax
42- 47 F6.3 mas e_plx Parallax uncertainty
49- 55 F7.1 mW/m2 LX ?=1000 ROSAT X-ray absolute flux (Stern et al.
1995, Cat. J/ApJ/448/683)
57- 63 F7.1 mW/m2 e_LX ?=1000 ROSAT X-ray standard uncertainty
65- 71 F7.3 mag FUV ?=99.999 GALEX far-UV absolute magnitude
(Martin et al. 2005, IAUS, 216, 221)
73- 79 F7.3 mag e_FUV ?=99.999 GALEX far-UV standard uncertainty
81- 87 F7.3 mag NUV ?=99.999 GALEX near-UV absolute magnitude
(Martin et al. 2005, IAUS, 216, 221)
89- 95 F7.3 mag e_NUV ?=99.999 GALEX near-UV standard uncertainty
97-103 F7.3 mag Bmag ?=99.999 Johnson B magnitude
(from ASCC-2.5, Cat. I/280)
105-111 F7.3 mag e_Bmag ?=99.999 Johnson B standard uncertainty
113-119 F7.3 mag Vmag ?=99.999 Johnson V magnitude
(from ASCC-2.5, Cat. I/280)
121-127 F7.3 mag e_Vmag ?=99.999 Johnson V standard uncertainty
129-135 F7.3 mag gMAG ?=99.999 APASS g absolute magnitude
(Henden et al., 2015AAS...22533616H)
137-143 F7.3 mag e_gMAG ?=99.999 APASS g uncertainty
145-151 F7.3 mag rMAG ?=99.999 APASS r absolute magnitude
(Henden et al., 2015AAS...22533616H)
153-159 F7.3 mag e_rMAG ?=99.999 APASS r uncertainty
161-167 F7.3 mag iMAG ?=99.999 APASS r absolute magnitude
(Henden et al., 2015AAS...22533616H)
169-175 F7.3 mag e_iMAG ?=99.999 APASS r uncertainty
178-183 F6.3 mag JMAG 2MASS J absolute magnitude
(Skrutsie et al. 2006, Cat. VII/233)
186-191 F6.3 mag e_JMAG 2MASS J uncertainty
194-199 F6.3 mag HMAG 2MASS H absolute magnitude
(Skrutsie et al. 2006, Cat. VII/233)
202-207 F6.3 mag e_HMAG 2MASS H uncertainty
210-215 F6.3 mag KsMAG 2MASS Ks absolute magnitude
(Skrutsie et al. 2006, Cat. VII/233)
218-223 F6.3 mag e_KsMAG 2MASS Ks uncertainty
225-231 F7.3 mag W1MAG ?=99.999 WISE band1 absolute magnitude
233-239 F7.3 mag e_W1MAG ?=99.999 WISE band1 uncertainty
241-247 F7.3 mag W2MAG ?=99.999 WISE band2 absolute magnitude
249-255 F7.3 mag e_W2MAG ?=99.999 WISE band2 uncertainty
257-263 F7.3 mag W3MAG ?=99.999 WISE band3 absolute magnitude
265-271 F7.3 mag e_W3MAG ?=99.999 WISE band3 uncertainty
273-279 F7.3 mag W4MAG ?=99.999 WISE band4 absolute magnitude
281-287 F7.3 mag e_W4MAG ?=99.999 WISE band4 uncertainty
289-294 F6.3 AU Res Resolution
296-301 F6.3 Msun Mass Estimated mass
303-307 I5 K Teff Estimated effective temperature
309-313 F5.2 [cm/s2] logg Estimated surface gravity
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Acknowledgements:
Taisiya Kopytova, kopytova(at)mpia.de
(End) Patricia Vannier [CDS] 15-Oct-2015