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[vsnet-survey 10] (fwd) MisV and TASS variables
From owner-vsnet-chat@kusastro.kyoto-u.ac.jp Sat May 13 22:09 JST 2000
Date: Sat, 13 May 2000 07:49:54 -0500
To: tass@listserv.wwa.com
Cc: vsnet-chat@kusastro.kyoto-u.ac.jp, kenic-k@astroarts.co.jp
From: Seiichi Yoshida <comet@aerith.net>
X-Distribute: distribute [version 2.1 (Alpha) patchlevel=24]
Subject: [vsnet-chat 2935] MisV stars in the TASS tenxcat database
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Dear TASS members,
(carbon copy to vsnet-chat)
I am Seiichi Yoshida working on the MISAO Project.
There are many photometric data of stars between Decl. +1.5 deg and
-2.4 deg in the TASS tenxcat database, which are available at the TASS
web pages. Some of MisV stars, the new variable stars discovered in
the MISAO Project, locate in this area. So I searched the TASS
database for the data of those MisV stars.
Here is the list of MisV stars in this area.
Code R.A. (J2000.0) Decl. Max Min Type Spectrum Period Epoch ID
----------------------------------------------------------------------------------------------------
MisV0009 185911.39 -013410.9 11.5C 13.4C ? ? ? ? USNO-A1.0_0825.13934695 IRAS18565-0138
MisV0114 185906.54 -000044.6 13.8C <14.8C ? ? ? ? IRAS18565-0004
MisV0130 190225.63 -003014.5 10.8C 12.0C SR? ? ? ? USNO-A1.0_0825.14192122 IRAS18598-0034 HS1332
MisV0136 185929.49 -004155.1 12.9C 14.5C ? ? ? ? IRAS18569-0046
MisV0138 190120.23 -012412.1 12.2C 13.3C ? ? ? ?
MisV0142 190049.48 -015340.8 12.1C 13.3C ? ? ? ? USNO-A1.0_0825.14069645
MisV0143 190017.64 -020236.6 12.3C 13.4C ? ? ? ? USNO-A1.0_0825.14031033
MisV0144 190029.32 -015450.8 12.2C 13.8C ? ? ? ? USNO-A1.0_0825.14046017
MisV0161 185911.08 -013850.1 13.2C <14.6C SR? ? ? ? IRAS18565-0143
MisV0162 190242.87 -014250.8 12.7C 14.5C SR? ? ? ? IRAS19001-0147
MisV0164 190215.88 -003317.8 11.8C 14.0C ? ? ? ? IRAS18597-0037
MisV0165 190236.50 -004739.6 12.8C 13.8C ? ? ? ? IRAS19000-0052
MisV0250 185751.03 -015900.8 10.7C 11.6C SR? ? ? ? USNO-A1.0_0825.13815862 IRAS18552-0203
MisV0339 185839.54 -005417.7 13.4C 14.7C ? ? ? ? USNO-A2.0_0825.13847347 IRAS18560-0058
MisV0351 190053.82 +000624.0 12.5C 14.3C ? ? ? ? USNO-A2.0_0900.13750040
MisV0352 190204.41 +001542.7 13.0C 14.6C ? ? ? ?
MisV0429 184231.88 -014631.2 12.8C 13.7C ? ? ? ? IRAS18399-0149
MisV0430 184339.03 -000429.2 13.0C 13.9C ? ? ? ? USNO-A2.0_0825.12758131 IRAS18410-0007
MisV0468 165729.81 +000001.0 12.5C 13.5C ? ? ? ? USNO-A2.0_0900.09141650
MisV0573 180208.02 -022230.7 14.6C 16.9C ? ? ? ? USNO-A2.0_0825.11759155
MisV0696 190236.04 -010617.0 12.6C 14.2C ? ? ? ? USNO-A2.0_0825.14163260
MisV0697 190042.17 -010813.1 13.3C <14.7C ? ? ? ? IRAS18580-0112
MisV0698 190228.42 -011216.6 13.7C 16.0C M? ? ? ? IRAS18598-0116
MisV0699 190019.08 -005956.2 13.8C 15.8C ? ? ? ?
MisV0700 185724.95 -013315.7 12.9C 15.3C ? ? ? ?
MisV0701 190031.77 -021220.4 13.0C 14.8C SR: ? ? ? USNO-A2.0_0825.14008002 IRAS18579-0216
MisV0740 175941.66 -003531.0 12.9C 14.7C ? ? ? ? USNO-A2.0_0825.11686444 IRAS17571-0035
MisV0824 175711.76 -002845.0 13.3C 14.1C SR? ? ? ? USNO-A2.0_0825.11601341 IRAS17545-0028
Then I searched the TASS database for these 28 stars. I tried to find
the data within 0.02 deg = 1.2 arcmin from the position of each MisV
star. As a result, the data of 9 stars are found.
The maximum brightness in the MISAO database of those 9 stars are:
10.7, 11.5, 12.1, 12.2, 12.9, 12.9, 13.0, 13.3, 13.4
On the other hand, the maximum brightness in the MISAO database of the
rest are:
10.8, 11.8, 12.2, 12.3, 12.5, 12.5, 12.6, 12.7, 12.8, 12.8, 12.9,
13.0, 13.0, 13.2, 13.3, 13.7, 13.8, 13.8, 14.6
I do not know why very bright stars like MisV0130 (10.8 mag at
maximum) or MisV0164 (11.8 mag at maximum) were not observed by TASS.
I put the temporary web page to show the light curve of those 9 stars,
including the TASS photometric data and MISAO data. Please see the
page:
http://www.aerith.net/tmp/TASS-MisV/index.html
Please note that this web page is temporary. The URL will be changed
in the near future.
Here is the comments on those 9 stars.
* MisV0009 = TASS J185911.0-013413
The light curve is very strange. The TASS I-band observations show
both the slow fading and short-time eclipse-like fading. The
elicpse-like event occurred between 2450995 and 2451022 (JD), with a
large amplitude as maximum 10.2 mag and minimum 12.4 mag.
The MISAO observations show the brightening. If it is linked to the
slow fading observed by TASS I-band, the period is 500 days or more,
and it was at minimum around 2451100. But while TASS I-band
observations were detecting the slow fading, TASS V-band observations
show it was constant, or maybe slightly brightening.
* MisV0136 =? TASS 5115-00315
The TASS observations show it is constant. Probably, the TASS observed
the nearby star, just southwest of MisV0136. If not, it began to fade
out at around 2451100 (JD) after the TASS observations finished, and
kept fading for 300 days.
* MisV0142 = TASS 5132-00240 = TASS J190049.2-015331
The variability of TASS I-band and V-band are well corresponding,
showing the long period variability. It seems to be linked with the
MISAO observations. It will be a SR-type variable star with a small
amplitude of about 1.3 mag and a period of 400-500 days.
* MisV0144 = TASS 5132-00144
The light curve is strange. The TASS V-band observations keep
constant, but it was faint sometimes. The TASS I-band observations
maybe show the short period variability between 10.5 and 11.5 mag with
a rough period of 20-30 days. There are only few MISAO observations.
* MisV0250 = TASS J185751.3-015857
The total light curve containing the TASS and MISAO observations shows
the long period variability with a period of about 400 days.
* MisV0339 =? TASS J185837.2-005406
The TASS observations show it is constant. Probably, the TASS observed
the nearby star, just southeast of MisV0339.
* MisV0701 = TASS J190030.4-021208 = TASS J190031.2-021212
The total light curve containing the TASS and MISAO observations
implies that it is a SR-type with a period of about 300 days. In that
case, it must have been at minimum around 2451200 (JD), after the TASS
observations and before the MISAO observatinos. But if it keeps fading
since 2451050 (JD), the period will be much longer.
* MisV0740 = TASS J175944.0-003554
Both the TASS observations and the MISAO observations are detecting
the fading for about 100 days. So the period is uncertain. But it will
be a long period variable star.
* MisV0824 = TASS J175712.0-002846
The TASS observations for 100 days show it was at maximum. The MISAO
observations for 300 days show it was at minimum. Therefore, it is a
long period variable star with a half period of 450 days from maximum
to minimum.
Best regards,
--
Seiichi Yoshida
comet@aerith.net
http://www.aerith.net/
vsnet-adm@kusastro.kyoto-u.ac.jp
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