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[vsnet-newvar 1811] On the new R CrB star HadV98

On the new R CrB star HadV98

   Upon a request, the discovery article of HadV98 is reproduced as below.
Almost all relevant messages were also posted to vsnet-alert.

Subject: [vsnet-newvar 1043] Dramatic fading: New Haseda variable (HadV98)

Dramatic fading: New Haseda variable (HadV98)

   Katsumi Haseda (Aichi, Japan) reports the discovery of a new variable
star (HadV98).  The variable had been almost constant for years, and
suddenly faded!  This star may be a new R CrB star or a long-period
eclipsing binary (or something else?).  The lack of IRAS detection may
be against the R CrB-type interpretation, but has been a result of
source confusion.  More observations, spectrscopic classification and
a search for past photographs, are urgently requested.

HadV98
= GSC6825.253 172314.54 -225204.4 (2000.0) 10.70 6 N
= GSC6825.253 172314.56 -225205.5 (2000.0) 10.72 6
= USNO0600.13841424 172314.559 -225205.28 (2000.0) 10.6 12.6
= 172314.5 -225205 (2000.0) 1092 0.97 TYC2-6825.253.1 (11.03 0.09) (12.16 0.19)
= 172314.7 -225150 (2000.0) CD-22.12017 9.7

  HadV97  RCB?/E?  10.6-(12.8p

Photographic magnitude estimates by VSOLJ members

object         YYYYMMDD(UT)   mag  code
HadV98         19970724.515  106p  Had.VSOLJ
HadV98         19970823.500  106p  Had.VSOLJ
HadV98         19980330.774  106p  Had.VSOLJ
HadV98         19990115.852  106p  Had.VSOLJ
HadV98         19990216.830  107p  Had.VSOLJ
HadV98         19990323.776  107p  Had.VSOLJ
HadV98         19990803.539  106p  Had.VSOLJ
HadV98         19990830.474  106p  Had.VSOLJ
HadV98         20000206.829  106p  Had.VSOLJ
HadV98         20000429.724  106p  Had.VSOLJ
HadV98         20000604.599  106p  Had.VSOLJ
HadV98         20000708.590  106p  Had.VSOLJ
HadV98         20000802.508  107p  Had.VSOLJ
HadV98         20000822.495  106p  Had.VSOLJ
HadV98         20000924.477  107p  Had.VSOLJ
HadV98         20010202.856  106p  Had.VSOLJ
HadV98         20010226.807  107p  Had.VSOLJ
HadV98         20010304.806  107p  Had.VSOLJ
HadV98         20010319.782  106p  Had.VSOLJ
HadV98         20010321.782  107p  Had.VSOLJ
HadV98         20010331.790  106p  Had.VSOLJ
HadV98         20010422.759  107p  Had.VSOLJ
HadV98         20010512.583  125p  Had.VSOLJ
HadV98         20010517.639  125p  Had.VSOLJ
HadV98         20010528.620  <128p  Had.VSOLJ
HadV98         20010615.672  <128p  Had.VSOLJ
HadV98         20010626.619  <128p  Had.VSOLJ
HadV98         20010713.572  <128p  Had.VSOLJ

Observer's code:
  Had: K. Haseda (Aichi, Japan)
       Instruments: 10cm F4.0 twin patrol camera +T-Max400(120)

Subject: [vsnet-newvar 1044] Dramatic fading: New Haseda variable (HadV98): confirmation by Kanatsu

Dramatic fading: New Haseda variable (HadV98): confirmation by Kanatsu

   K. Kanatsu (Matsue, Japan) has confirmed the fading.

Photographic magnitude estimates by VSOLJ members

Visual magnitude estimates by VSOLJ members

object         YYYYMMDD(UT)   mag  code
HadV98         19990225.822   111  Knk.VSOLJ
HadV98         19990316.781   110  Knk.VSOLJ
HadV98         19990327.785   110  Knk.VSOLJ
HadV98         19990511.676   105  Knk.VSOLJ
HadV98         19990608.618   107  Knk.VSOLJ
HadV98         19990611.601   107  Knk.VSOLJ
HadV98         19990614.609   107  Knk.VSOLJ
HadV98         20000408.765   110  Knk.VSOLJ
HadV98         20000428.681   110  Knk.VSOLJ
HadV98         20000512.723   108  Knk.VSOLJ
HadV98         20000529.637   107  Knk.VSOLJ
HadV98         20000604.676   107  Knk.VSOLJ
HadV98         20010321.790   108  Knk.VSOLJ
HadV98         20010401.792   107  Knk.VSOLJ
HadV98         20010418.753   108  Knk.VSOLJ
HadV98         20010513.636   118: Knk.VSOLJ
HadV98         20010519.628  <118  Knk.VSOLJ
HadV98         20010714.623  <118  Knk.VSOLJ
HadV98         20010720.581  <118  Knk.VSOLJ

Observer's code:
  Had: K.Kanatsu(Matsue,Shimane,Japan)
       instruments:f200mm+PO0(T-MAX400(120))

PS.
>  HadV97  RCB?/E?  10.6-(12.8p

  in the preceding post should read

  HadV98  RCB?/E?  10.6-(12.8p

Subject: [vsnet-newvar 1045] HadV98 - UCAC1 data

UCAC1 data for HadV98:

RA 17h 23m 14.55s

Dec -22d 52' 06.3"

proper motions:

RA +6.4 +/- 3.9 ms/y [milliarcsecs per year]

Dec -9.7 +/- 2.8 ms/y

[proper motion from 4 catalogue positions]

UCAC1 midway twixt R and V red sensitive CCD magnitude is 10.48 at UCAC1
obs mid epoch 1999.490


Given the above magnitude and assuming that the Haseda and Kanatsu 'p'
magnitudes are photovisual _suggests_ that the object is not very coloured

Cheers

John

John Greaves
UK

Subject: [vsnet-newvar 1046] R: [vsnet-alert 6227] Dramatic fading: New Haseda variable (HadV98): confirmation by Kanatsu

Dear All,

I Have posted an image of HadV98 in vsnet-image.
The image was been taken at 2000 06 21.84 UT with a 200 mm lens f/3.5 on a
35 mm film Kodak 400 ISO.  I Have produced fotometric measures on image and
I find m1~10.5 with GSC catalog and Astroart program.

Regards,

Toni Scarmato

Subject: [vsnet-newvar 1047] HadV98 observations by Toa

CCD magnitude estimates by VSOLJ members

object         YYYYMMDD(UT)   mag  code
HadV98         20010418.810  104C  Toa.VSOLJ
HadV98         20010808.497  130C  Toa.VSOLJ  faint!

Observer's code:
  Toa: Akira Takao (Kita-kyushu, Japan)
       instruments:f200mm F4 Telephotolens+ST-8,unfiltered

Subject: [vsnet-newvar 1076] HadV98 brightening again!

HadV98 brightening again!

   Haseda reports that the peculiar variable star (R CrB star?) HadV98 has
recovered from the recent deep fading.

Photographic magnitude estimates by VSOLJ members

object         YYYYMMDD(UT)   mag  code
HadV98         20010916.492  117p  Had.VSOLJ

Observer's code:
  Had: K. Haseda (Aichi, Japan)
       Instruments: 10cm F4.0 twin patrol camera +T-Max400(120)

Subject: [vsnet-newvar 1077] HadV98: recovery process from the recent fading

HadV98: recovery process from the recent fading

  YYYYMMDD(UT)   mag  observer
  20010528.619  <128p  (K. Haseda)
  20010615.672  <128p  (K. Haseda)
  20010626.619  <128p  (K. Haseda)
  20010713.572  <128p  (K. Haseda)
  20010714.623  <118  (K. Kanatsu)
  20010720.581  <118  (K. Kanatsu)
  20010724.558  <131p  (K. Haseda)
  20010808.142  136V  (S. O'Connor)
  20010808.151  12.57Rc  (S. O'Connor)
  20010808.497  130C  (A. Takao)
  20010815.082  136V  (S. O'Connor)
  20010815.085  12.60Rc  (S. O'Connor)
  20010825.089  13.46V  (S. O'Connor)
  20010911.510  116p  (K. Haseda)
  20010916.492  117p  (K. Haseda)

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