2005A&A...438..317D


Query : 2005A&A...438..317D

2005A&A...438..317D - Astronomy and Astrophysics, volume 438, 317-324 (2005/7-4)

Outbursts on normal stars. FH Leo misclassified as a novalike variable.

DALL T.H., SCHMIDTOBREICK L., SANTOS N.C. and ISRAELIAN G.

Abstract (from CDS):

We present high resolution spectroscopy of the common proper motion system FHLeo (components HD96273 and BD+072411B), which has been classified as a novalike variable due to an outburst observed by Hipparcos, and we present and review the available photometry. We show from our spectra that neither star can possibly be a cataclysmic variable, instead they are perfectly normal late-F and early-G stars. We measured their radial velocities and derived the atmospheric fundamental parameters, abundances of several elements including Fe, Ni, Cr, Co, V, Sc, Ti, Ca and Mg, and we derive the age of the system. From our analysis we conclude that the stars do indeed constitute a physical binary. However, the observed outburst cannot be readily explained. We examine several explanations, including pollution with scattered light from Jupiter, binarity, microlensing, background supernovae, interaction with unseen companions and planetary engulfment. While no explanation is fully satisfactory, the scattered light and star-planet interaction scenarios emerge as the least unlikely ones, and we give suggestions for further study.

Abstract Copyright:

Journal keyword(s): stars: abundances - binaries: general - stars: fundamental parameters - planetary systems - stars: individual: HD 96273 - stars: individual: BD+07 2411B

Simbad objects: 14

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Number of rows : 14
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 NGC 752 OpC 01 57 41 +37 47.1           ~ 566 0
2 Cl Melotte 25 OpC 04 26 54.00 +15 52 00.0           ~ 2776 0
3 NGC 2168 OpC 06 08 54 +24 20.0           ~ 483 0
4 NGC 2682 OpC 08 51 18 +11 48.0           ~ 2111 0
5 HD 80606 PM* 09 22 37.5769478105 +50 36 13.434928660   9.78 9.00     G8V 292 2
6 HD 95848 * 11 03 41.2935319402 +07 34 55.082494208   8.28 7.25     K0 14 0
7 * chi Leo PM* 11 05 01.02754 +07 20 09.6235   4.94 4.62 4.4   F2III 105 0
8 V* FH Leo No* 11 06 07.4166578232 +07 02 00.458263326   9.16 8.75     F8 18 0
9 AG+07 1510 PM* 11 06 07.5593940375 +07 01 52.413830443   10.91 10.14     G3V 6 0
10 HD 96272 PM* 11 06 09.4043434742 +07 08 23.112454284   7.68 7.27     F5 11 0
11 HD 96419 PM* 11 06 51.7721118400 +06 41 53.394588573   8.92 7.76     K2 10 0
12 NGC 6633 OpC 18 27 31.2 +06 34 12           ~ 337 0
13 HD 179949 BY* 19 15 33.2300861317 -24 10 45.673372382   6.772 6.237     F8V 365 1
14 HD 192263 BY* 20 13 59.8455148268 -00 52 00.771665295 9.447 8.724 7.767 7.231 6.771 K1/2V 217 1

    Equat.    Gal    SGal    Ecl

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2021.07.29-02:51:59

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