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[vsolj-alert 32] Superoutburst of SBS 1017+533

Superoutburst of SBS 1017+533

　Second Byurakan Surveyで発見された新激変星 SBS 1017+533が、近くのROSAT
　Ｘ線源と同一らしいことが示唆され、Garanavichがスペクトルを撮ってみると
　なんとアウトバーストしている矮新星のスペクトルが得られた、という経緯の
　天体です。

　このアウトバーストの知らせを受けて、Vanumunster, Nogami がそれぞれ独立
　にＣＣＤ測光を行い、スーパーハンプを検出しています。

From owner-vsnet-alert@kusastro.kyoto-u.ac.jp Sun Feb  1 23:18 JST 1998
Date: Sun, 1 Feb 1998 15:13:23 +0100 (MET)
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To: tvanmuns@innet.be
From: Tonny Vanmunster <tvanmuns@innet.be>
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Subject: [vsnet-alert 1448] CVC 161 [SBS 1017+533 new UGSU star]
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BELGIAN ASTRONOMICAL SOCIETY V.V.S. -  Working Group Variable Stars
Cataclysmic Variables Circular No.161             1998, February 01
Ed.: T. Vanmunster, Walhostraat 1A, 3401 Landen, BELGIUM
     Internet: tvanmuns@innet.be                  TEL. 32-11-831504
     CVC Web Page : http://vsnet.astro.columbia.edu/~cba/cvc
===================================================================

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.


Editorial Absence
-----------------

Please note that the Editor will be absent in the period from
February 9th till February 17th, 1998.


Tonny Vanmunster

From owner-vsnet-alert@kusastro.kyoto-u.ac.jp Tue Feb  3 02:08 JST 1998
Date: Mon, 2 Feb 1998 18:01:19 +0100 (MET)
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From: Tonny Vanmunster <tvanmuns@innet.be>
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Subject: [vsnet-alert 1450] CVC 162 (SBS 1017+533 - refined superhump period)
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BELGIAN ASTRONOMICAL SOCIETY V.V.S. -  Working Group Variable Stars
Cataclysmic Variables Circular No.162             1998, February 02
Ed.: T. Vanmunster, Walhostraat 1A, 3401 Landen, BELGIUM
     Internet: tvanmuns@innet.be                  TEL. 32-11-831504
     CVC Web Page : http://vsnet.astro.columbia.edu/~cba/cvc
===================================================================

SBS 1017+533 [UGSU, 13? - 16?]
==============================

We have been able to acquire additional time-series CCD photometry
of SBS 1017+533 at CBA Belgium Observatory. Observations were 
carried out during a period of 10.6h on the night of February 1/2,
1998, under excellent conditions (extremely clear and cold; -15 C).

The resulting data clearly show prominent superhumps, with a stable
periodic signal at 0.0697 +/- 0.0001 d (heliocentric correction
applied; linear trends removed), using the PDM method. The mean
semi-amplitude was 0.12 mag.

Combined with yesterday's observations (total of 18.4h of unfiltered
photometry data), a similar superhump period value was derived.

Belgian weather for the next couple of nights will be rather bad,
so we rely on other observatories to continue monitoring this
interesting new UGSU member.


Tonny Vanmunster

From owner-vsnet-alert@kusastro.kyoto-u.ac.jp Tue Feb  3 07:54 JST 1998
Date: Tue, 3 Feb 1998 07:52:29 +0900 (JST)
From: Daisaku Nogami <nogami@kusastro.kyoto-u.ac.jp>
To: vsnet-alert
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X-Sequence: vsnet-alert 1452
Subject: [vsnet-alert 1452] Superhumps in SBS1017+533
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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

　そこで注目されるのが、そのアウトバースト振幅の小ささです（スーパーアウト
　バーストでおそらく３等ぐらい。通常のSU UMa型では4.5-5等以上）。もしかす
　ると、新しい ER UMa型矮新星なのかも知れません。極大光度も１２等台後半で
　もあり、多くの方の監視が望まれます。

  102026.65  +530432.6    2000 SBS1017+533 UGSU 13-16

VSNET chart (from USNO A1.0, V = r + 0.375(b-r) assumed):

------------------------------------------------------------------------
frame SBS1017+533
date from USNO A1.0
 9600 14403 1594 0 SBS
 9139 13956 1981 0 
 9942 11451 1561 0 
 7920 17247 1789 0 
 10831 10710 1921 0 
 5674 15165 1832 0 
 4920 16668 1798 0 
 14872 15157 1690 0 
 8881 8216 1468 0 
 11856 20274 2000 0 
 3129 13085 1608 0 
 14602 18841 1920 0 
 9761 21897 1942 0 
 3266 10212 1864 0 
 12521 7335 1871 0 
 17096 11393 2006 0 
 1328 16148 1975 0 
 12576 6118 1921 0 
 16250 20269 1984 0 
 583 14103 1851 0 
 3229 7879 1981 0 
 13884 22501 1990 0 
 257 11659 1971 0 
 474 9449 1505 0 
 11993 4189 1921 0 
 20071 13614 1729 0 
 11518 3605 1598 0 
 15468 4074 1459 0 
 9616 2414 1964 0 
 9518 2363 1925 0 
 21100 18352 2040 0 
 10547 2270 1980 0 
 7602 2256 2019 0 
 -3053 15375 1944 0 
 21574 9146 1821 0 
 20272 22144 1929 0 
 13725 1845 1899 0 
 -3644 14333 1594 0 
 -333 23596 1571 0 
 13881 1488 1999 0 
 23030 16732 1802 0 
 13800 27377 2000 0 
 8420 28143 1841 0 
 -3913 17190 1430 0 
 7575 625 1962 0 
 -3939 19273 2029 0 
 20414 4443 1989 0 
 7000 -135 2035 0 
 22207 22215 1875 0 
 24002 10728 1980 0 
 -4671 18551 2000 0 
------------------------------------------------------------------------

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