J/A+A/399/271 Oscillations in the PMS star V346 Ori (Pinheiro+, 2003)
Oscillations in the PMS delta-Scuti star V346 Ori.
Pinheiro F.J.G., Folha D.F.M., Marconi M., Ripepi V., Palla F.,
Monteiro M.J.P.F.G., Bernabei S.
<Astron. Astrophys. 399, 271 (2003)>
=2003A&A...399..271P 2003A&A...399..271P
ADC_Keywords: Stars, variable ; Photometry, UBV ; Photometry, uvby
Keywords: stars: evolution - stars: fundamental parameters -
stars: oscillations - stars: pre-main sequence -
stars: variables: delta Sct - stars: individual: V346 Ori
Abstract:
We report the discovery of periodicities in the light curve of the
Pre-Main Sequence (PMS) Herbig Ae star V346 Ori. We interpret
variations in the light curve of the star as the superposition of at
least two periodic signals that result from delta Scuti-type stellar
oscillations. The computation of linear non-adiabatic radial pulsation
models for PMS stars reproduces these periods for a 1.55M☉ star
with Teff=7410K and log(L/L☉)=0.74 pulsating in the fundamental
and in the second overtone. If our assumption of radial oscillations
is indeed correct, the star's location on the HR diagram places it at
a distance significantly smaller than that of the Orion star forming
region, hence raising questions regarding the evolutionary status of
V346 Ori. Observations with better time sampling and spanning a longer
period of time are needed if the latter question is to be addressed
fully.
Description:
Differential photometry of the pre-main sequence star V346 Ori. The
data presented here was obtained during the nights of 12 December 2000
(Stroemgren u and v bands) and 4 November 2001 (Johnson U, B and V
bands).
Objects:
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RA (2000) DE Designation(s)
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05 24 42.8 +01 43 48.3 HD 287841 = V346 Ori
05 24 36.9 +01 48 03.5 HD 35408
05 24 38.6 +01 48 38.8 HD 35409
05 24 13.0 +01 46 42.1 HD 35351
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File Summary:
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FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table1.dat 73 37 De-trended and zero averaged Stroemgren u and v
differential magnitudes of V346 Ori relative to
HD 35409 and HD 35408
table2.dat 56 764 De-trended and zero averaged Johnson U, B and V
differential magnitudes of V346 Ori relative
to HD 35351
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Byte-by-byte Description of file: table1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
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1- 9 F9.7 d JD-2451891u u-band Julian date (origin HJD=2451891)
12- 17 F6.3 mag Du(V-8) V346 Ori differential u magnitude
relative to HD 35408
20- 25 F6.3 mag Du(V-9) V346 Ori differential u magnitude
relative to HD 35409
28- 33 F6.3 mag Du(8-9) HD 35408 differential u magnitude
relative to HD 35409
39- 47 F9.7 mag JD-2451891v v-band Julian date (origin HJD=2451891)
50- 55 F6.3 mag Dv(V-8) V346 Ori differential v magnitude
relative to HD 35408
58- 63 F6.3 mag Dv(V-9) V346 Ori differential v magnitude
relative to HD 35409
66- 71 F6.3 mag Dv(8-9) HD 35409 differential v magnitude
relative to HD 35408
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Byte-by-byte Description of file: table2.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 8 F8.5 d JD-2452200U U-band Julian date (origin HJD=2452200)
10- 16 F7.4 mag DU(V-1) U-band V346 Ori differential photometry
relative to HD 35351
21- 28 F8.5 d JD-2452200B B-band Julian date (origin HJD=2452200)
30- 36 F7.4 mag DB(V-1) B-band V346 Ori differential photometry
relative to HD 35351
41- 48 F8.5 d JD-2452200V V-band Julian date (origin HJD=2452200)
50- 56 F7.4 mag DV(V-1) V-band V346 Ori differential photometry
relative to HD 35351
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Acknowledgements: Daniel F.M. Folha
(End) Fernando J.G. Pinheiro, Daniel F. M. Folha [CAUP] 06-Dec-2002