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[vsnet-alert 2460] SBS1017+533 outburst
- Date: Sat, 19 Dec 1998 18:36:42 +0900 (JST)
- To: vsnet-alert
- From: Taichi Kato <tkato>
- Subject: [vsnet-alert 2460] SBS1017+533 outburst
- Cc: news@cba.phys.columbia.edu
- Sender: owner-vsnet-alert@kusastro.kyoto-u.ac.jp
SBS1017+533 outburst
As already reported by T. Watanabe (VSOLJ), the recently discovered
SU UMa-type dwarf nova SBS 1017+533 is first time in outburst since its
last observed one, in 1998 May.
YYMMDD(UT) mag observer
981111.735 <138 (T. Watanabe)
981113.730 <137 (T. Watanabe)
981115.108 <156 (G. Poyner)
981116.074 <151 (G. Poyner)
981117.692 <143 (T. Watanabe)
981118.674 <143 (T. Watanabe)
981123.687 <134 (T. Watanabe)
981129.053 <151 (G. Poyner)
981211.699 <137 (T. Watanabe)
981217.649 <140 (T. Watanabe)
981218.681 136 (T. Watanabe)
Extracted from T. Watanabe's article (VSOLJ Variable Star Bulletin,
in press):
SBS1017+533 (R.A.10h 20m 30s Dec.+53o 02' 07" (2000)) is a cataclysmic
variable discovered by the SBS servey (Balayan 1997). The star was identified
with the ROSAT X-ray source RX J1020.4+5304 (Bade N. 1998, independently
Kato 1998 and Garnavich 1998) The first outburst was discovered by Garnavich
(1998) on 1998 Jan. 27.5. Superhumps with a period of 0.069 d were detected
(Vanmunster 1998a, Nogami 1998), confirming the UGSU type.
After this outburst, VSOLJ members detected additional 2 normal outbursts
(total 3 outbursts) by visual observations between 1998 Feb.and 1998 Jun.
The light curve is shownin Figure 1. and the original data are given in Table
1.Both normal outbursts were confirmed by other observers (Kinunnen 1998,
Poyner 1998 and Vanmunster 1998b).
References
Bade N. et al., Astronomy and Astrophysics Supplement 127, 145 (1998)
Balayan S. K., Astrophysics 40, 101 (1997)
Garnavich P., VSNET-alert 1441 (1998)
Kato T., VSNET 1133 (1998)
Kinunnen T., VSNET-obs 10331 (1998)
Nogami D., VSNET-alert 1452 (1998)
Poyner G., VSNET-obs 11555 (1998)
Vanmunster T., Cataclysmic Variables Circular 161 (1998a)
Vanmunster T., et al., VSNET-alert 1726 (1998b)
Extracted from relevant vsnet-alert and vsnet issues:
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[vsnet 1133]
Date: Mon, 26 Jan 1998 16:18:22 +0900 (JST)
From: Taichi Kato <tkato>
CVs from SBS survey
In a recent article of Astrophysics 40, 101 (1997, original in Astrofizika
40, 153, 1997), S. K. Balayan presents spectral classification of SBS
(Second Byurakan Sky Survey). 10 CVs were idetified. Seven of them are
already well-known CVs or related systems.
...
Three remaining new CVs are
(2000.0) mpg
SBS 0755+600 075926.60 +595349.98 17.5
SBS 1017+533 102030 +530207 17.0
SBS 1150+599 115324.88 +593955.15 17.5
Identifications of other objects suggest the accuracy of the coordinates
is not significantly better than 1 arcsec.
Among them, SBS 0755+600 is pretty close to a USNO star at 075926.44
+595351.3, r=15.5, b=16.0, which may be identical with the SBS object
caught in outburst. Located close to SBS 1017+533 a ROSAT X-ray source,
which may be identified with a USNO star at 102026.65 +530432.6, r=15.6,
b=16.5, but the connection with the SBS object is not certain.
----------------------------------------------------------------------------
[vsnet-alert 1441]
> From: peterg@mars.harvard.edu (Peter Garnavich)
> Subject: Re: [vsnet 1133] CVs from SBS survey
> To: tkato@kusastro.kyoto-u.ac.jp (Taichi Kato)
It has been rather cloudy at the MMT so I have been
getting spectra of the new CVs from the SBS catalog.
SBS 0755+600 is a beautiful CV with broad Balmer lines and some
HeI. No HeII 4686 is seen.
SBS 1017+533 The coordinates were not good enough to find a single
star so I went to USNO at 10:20:26.65 +53:04:32.6 (2000)
and I was suprised to find a 13th magnitude star there.
It is in outburst (Jan 27.5 UT). The spectrum shows
a CV in outburst with broad Balmer absorption except
for Halpha which is in weak emission.
----------------------------------------------------------------------------
[CVC 161, also in vsnet-alert 1448]
From: Tonny Vanmunster <tvanmuns@innet.be>
SBS 1017+533 [UGSU, 13? - 16?]
==============================
Peter Garnavich recently reported his detection of an outburst of
SBS 1017+533 [VSNET alert 1441]. He also reported spectral observations,
showing broad Balmer absorption lines, but weak Halpha emission.
Unfiltered CCD photometry by Tonny Vanmunster, CBA Belgium Observatory,
on 1998, January 31, using a 0.25-m telescope and ST-7 CCD camera,
reveals the existence of a periodic modulation in this system, which
has the typical signature of a superhump. It therefore is most likely
that SBS 1017+533 is a new member of the SU UMa-type cataclysmic
variables !
Our observations were made under quite unfavourable conditions (strong
windws), during a 7.8h observing session and show a periodic signal
at 0.069 +/- 0.001 d, with a mean semi-amplitude of 0.11 mag, after
heliocentric correction and removal of a linear trend of decline
(period determined using the PDM method).
SBS 1017+533 is located at RA = 10h20m26.65s and decl = +53d04'32.6"
(Epoch J2000.0).
Follow-up time-series CCD photometry is highly recommended.
----------------------------------------------------------------------------
[vsnet-alert 1452]
From: Daisaku Nogami <nogami@kusastro.kyoto-u.ac.jp>
Dear Colleagues,
We, Ouda Team, had carried on a 7-hour run of V-band
time-resolved photometry of SBS 1017+533 from 1998
Feb. 2.18 (UT) at Ouda Station and independently
detected apparent superhumps with an amplitude of
0.13 mag. A PDM period analysis, after the heliocentric
correction and a subtraction of linear decline trend,
gives 0.069 (+-0.001) d as the best estimated superhump
period, confirming the Tonny's results mentioned
in vsnet-alert 1450 (CVC 162).
Best regards,
Daisaku Nogami
Ouda Team
----------------------------------------------------------------------------
[vsnet 1360]
From: Taichi Kato <tkato>
Date: Tue, 24 Mar 1998 13:30:10 +0900 (JST)
SBS1017+533
I have noticed this new SU UMa-type dwarf nova was already cataloged in
The Hamburg/RASS Catalogue of Optical Identifications (Astron. Astrophys.
Suppl. in press). This catalogue indentified the X-ray source with a 17-mag
optical counterpart showing a CV spectrum.
RX J1020.4+5304 = 10 20 26.6 +53 04 32 17.0 mag CV
from vsnet 1133 (T. Kato): CVs from SBS survey
> Located close to SBS 1017+533 a ROSAT X-ray source,
> which may be identified with a USNO star at 102026.65 +530432.6, r=15.6,
> b=16.5, but the connection with the SBS object is not certain.
Regards,
Taichi Kato
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