J/MNRAS/437/906 Cl* IC 348 H 254 VRI light curves (Ripepi+, 2014)
Application of the Baade-Wesselink method to a pulsating cluster Herbig Ae star:
H254 in IC348.
Ripepi V., Molinaro R., Marconi M., Catanzaro G., Claudi R.,
Daszynska-Daszkiewicz J., Palla F., Leccia S., Bernabei S.
<Mon. Not. R. Astron. Soc., 437, 906-915 (2014)>
=2014MNRAS.437..906R 2014MNRAS.437..906R (SIMBAD/NED BibCode)
ADC_Keywords: Stars, variable ; Photometry, VRI
Keywords: stars: abundances - stars: fundamental parameters -
stars: pre-main-sequence - stars: variables: δ Scuti -
stars: variables: T Tauri, Herbig Ae/Be -
open clusters and associations: individual: IC 348
Abstract:
In this paper we present new photometric and radial velocity data for
the PMS δ Sct star H254, member of the young cluster IC 348.
Photometric V, RC, IC light curves were obtained at the Loiano and
Asiago telescopes. The radial velocity data were acquired by means of
the SARG@Telescopio Nazionale Galileo spectrograph. High-resolution
spectroscopy allowed us to derive precise stellar parameters and the
chemical composition of the star, obtaining Teff=6750±150K;
logg=14.1±0.4dex and [Fe/H]=-0.07±0.12dex. Photometric and
spectroscopic data were used to estimate the total absorption in the V
band AV=2.06±0.05mag, in agreement with previous estimates. We
adopted the technique of the difference in phase and amplitude between
different photometric bands and radial velocities to verify that H254
is (definitely) pulsating in a radial mode. This occurrence allowed us
to apply the CORS realization of the Baade-Wesselink method to obtain
a value for the linear radius of H254 equal to 3.3±0.7R☉. This
result was used in conjunction with photometry and effective
temperature to derive a distance estimate of 273±23pc for H254, and,
in turn for IC 348, the host cluster. This value is in agreement
within the errors with the results derived from several past
determinations and the evaluation obtained through the Hipparcos
parallaxes. Finally, we derived the luminosity of H254 and studied its
position in the Hertzsprung-Russell diagram. From this analysis it
results that this δ Scuti occupies a position close to the red
edge of the instability strip, pulsates in the fundamental mode, has a
mass of about 2.2M☉ and an age of 5±1Myr, older than previous
estimates.
Description:
Photometric data were acquired in the Johnson-Cousins system V, RC
and IC with the AFOSC1 and BFOSC2 instruments at the 1.8m Asiago and
1.54m Loiano telescopes, respectively. The AFOSC@1.82m instrument was
equipped with a TK1024AB 1024x1024 CCD, with a pixel size of
0.47-arcsec and a total field of view of about 8.1-arcminx8.1-arcmin.
The BFOSC@1.54m was equipped with an EEV CCD 1300x1340 pixel of
individual size 0.58-arcsec and a total field of view of
13-arcminx13-arcmin.
The spectroscopic observations were carried out with the SARG
instrument, which is a high-resolution (from R=29000 to 164000)
cross-dispersed echelle spectrograph covering a spectral range from
λ=370 to 1000nm mounted at Telescopio Nazionale Galileo (TNG,
La Palma, Canarie, Spain).
Objects:
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RA (2000) DE Designation(s)
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03 44 31.20 +32 06 22.1 Cl* IC 348 H 254 = V* V705 Per
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 25 744 V, RC and IC photometry for H254
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 11 F11.5 d HJD Heliocentric Julian date (HJD-2400000)
13- 19 F7.4 mag mag Magnitude in Band
21 A1 --- Band [VRI] Observed band (Johson-Cousins)
23- 25 A3 --- Comp Comparison star (H83 or H89)
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History:
From electronic version of the journal
References:
Ripepi et al., Paper I 2002A&A...391..587R 2002A&A...391..587R
(End) Patricia Vannier [CDS] 10-Mar-2015