AAVSO Home



Welcome, Guest. You are not logged in.
Log in
    Revise    New Search
Details for Revision 7
Log in to retrieve additional aliases from SIMBAD.
Name
  ASAS J193833+4604.0  
AAVSO UID
000-BMK-991 (841 observations)  
Constellation
Cygnus Sequence
J2000.0
19 38 32.61 +46 03 59.1  (294.63589 +46.06643) Search nearby
B1950.0 19 37 01.90 +45 57 04.4
Galactic coord. 79.019 +11.674
Other names

(Internal only)
2MASS J19383260+4603591 ASAS 193833+4604.0 EQ J1938+4603
KIC 09472174 KIC 9472174 KID 09472174
NSVS 5608178 NSVS 5629361  
(Not logged in)  Add name
Variability type
EA/HW+V361HYA
Spectral type sdB+dM
Mag. range
12.05 - 12.20 V
Discoverer --
Epoch
23 Jun 2008 (HJD 2454640.8642) Ephemeris
Outburst --
Period 0.125765300 d  (3.0183672 h)
Rise/eclipse dur. --
Remarks
Some references may be clicked to view in new window. Roll over index number to view submission details.
1 2015A&A...577A.146B It likely hosts a Jupiter-mass object orbiting with a period of 416 d.
2 2010arXiv1006.4267O Grazing eclipses. Pulsation frequencies from 0.05 to 4.4 mHz.
(Not logged in)  Add remark
References
Click reference title/citation to view in new window. Roll over index number to view submission details.
1 Schaffenroth, V.; Barlow, B. N.; Geier, S.; et al., 2019, The EREBOS
project: Investigating the effect of substellar and low-mass stellar
companions on late stellar evolution. Survey, target selection, and
atmospheric parameters		 2019A&A...630A..80S
2 Baran, A. S.; Zola, S.; Blokesz, A.; et al., 2015, Detection of a planet in
the sdB + M dwarf binary system 2M 1938+4603		 2015A&A...577A.146B
3 R.W. Slawson et al., 2011, arXiv:1103.1659v1 [astro-ph.SR] 2011arXiv1103.1659S
4 R.W. Slawson et al., 2011, arXiv:1103.1659v1 [astro-ph.SR] (Light curve) 2011arXiv1103.1659S
5 R.H. Ostensen et al., 2010, arXiv:1006.4267v1 [astro-ph.SR] 2010arXiv1006.4267O
6 A. Prsa et al., 2010, arXiv:1006.2815v1 [astro-ph.SR] (Light curve) 2010arXiv1006.2815P
7 A. Pigulski, G. Pojmanski, B. Pilecki, D. Szczygiel, 2008,
arXiv:0808.2558v2 [astro-ph]		 2008arXiv0808.2558P
8 A. Pigulski, G. Pojmanski, B. Pilecki, D. Szczygiel, 2008,
arXiv:0808.2558v2 (online data)		 2008arXiv0808.2558P
9 Kepler data (MAST) --
External Links
Links open in a new window. Not all links may be valid for this particular target.
Location    Go   
Select a Location for more details.
Supporting Documents
Click document name to open or save. Browser plug-in or other software may be required for viewing.
1 Phase plot of NSVS data Wils, Patrick 2010-03-17 02:44 UTC Phase plot with a period of 0.125765 d using NSVS data.
(Not logged in)  Add document
Revision History
Currently approved revision is checked. Click revision number to view details of that revision.
8 Otero, Sebastian Alberto 2021-05-12 21:45 UTC Period, epoch, eclipse duration and amplitude from 2015A&A...577A.146B.
7 Otero, Sebastian Alberto 2020-10-24 00:02 UTC Gaia DR2 position.
6 Admin, VSX 2017-12-26 21:32 UTC Added HW Vir-subtype.
5 Admin, VSX 2011-03-13 04:50 UTC Update from [2011arXiv1103.1659S].
4 Admin, VSX 2010-06-24 01:54 UTC Update from [2010arXiv1006.4267O].
3 Admin, VSX 2010-06-19 02:03 UTC Update from [2010arXiv1006.2815P].
2 Wils, Patrick 2010-03-17 02:44 UTC With V-I = -0.25 (ASAS) and J-Ks = -0.20 (2MASS), this is a very blue object, not even taking into account possible interstellar extinction (E(B-V) = 0.156 in the direction of the object). The available magnitudes in different passbands (2MASS, CMC14, Tycho-2, ASAS) suggest a temperature of around 30000K.
The larger amplitude in I of the ASAS data (compared to the amplitude in V) points to reflection of the light of the hot star on the surface of a faint companion, rather than to pulsation (in which case the amplitude in V would be larger) or to changing aspects of an ellipsoidal shape (in which case the amplitudes would be similar).
1 Admin, VSX 2008-08-23 01:31 UTC Preserved original object data.

Guidelines    FAQ    Manual    Forum    Variability Types    Passbands    Copyright    Acknowledgments    Privacy    Contact    Help us   
The International Variable Star Index
© 2005-2025 American Association of Variable Star Observers (AAVSO)
Version 1.1 [C]
172.30.2.216