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[vsnet-chat 893] Re: Magnitudes, sequences...action time
- Date: Sun, 03 May 1998 01:00:32 +0300
- To: tkato@kusastro.kyoto-u.ac.jp, vsnet-chat@kusastro.kyoto-u.ac.jp, astroman@voyager.co.nz
- From: Berto Monard <lagmonar@csir.co.za>
- Subject: [vsnet-chat 893] Re: Magnitudes, sequences...action time
- Disclaimer: The CSIR exercises no editorial control over E-mail messages originating in the organisation and the views in this message are therefore not necessarily those of the CSIR and/or its employees.
- Sender: owner-vsnet-chat@kusastro.kyoto-u.ac.jp
Dear Stan, Taichi and others,
From previous valuable inputs (Skiff, Henden, Sumner, Kyiota and yourselves) and your eventual PE/CCD expertise it's clear that sequence measurements require work and commitment, but they will be appreciated. Clear skies + precise measurements + proper photometric standards will yield accurate sequences. That's what we, visual VS observers, want to work with and, believe me, accuracies of + or - 0.1magnitude up to mag 12, and 0.2 up to mag 13.5 are fit for purpose.
In order not to waste your efforts, it is necessary to establish proper target selection.. In this respect it is important to avoid duplicating acceptable* sequences in existing 'fields' but equally important to check and improve questionnable ones.
* When is it acceptable? imo if it stands the eyetest without feelings of discomfort, yes quite a subjective test method. Please throw in some opinions..
One of the proverbs say that you have to work the iron, when it's hot... so lets work it. I hope the weather is fine....
I have quite an extensive list of variables and Southern starfields that may need proper calibration, but prefer here to direct attention to targets that are 'hopefully' monitored by more observers. Most of these targets are cataclysmic and/or symbiotic. They are all reachable by Stan but surely Taichi and the Ouda team could give assistance for those North of -27 degrees... which I therefore will mark with O.
Four remarks before dumping my lists:
1. it's important that those sequences will be adopted by official VS organisations. Therefore I suggest the measured sequences to be offered to willing experienced observers for visual validation and the official publication of the sets as they are finalised.
2. Field size requirements could make certain fields difficult: pe the TU Crt field measured by Ouda team yielded no useful sequences
3. targets of opportunity: preferential treatment of targets like Novae or Supernovae, when they offer themselves
4. chatters and observers to check on the lists, to make 'corrections', select preferred targets and add/remove as they see fit. In the latter case, provide existing sequences or indicate if the variable isn't worth the effort..
CV list
Target / approx. RA/DE 2000 / required magnitude range / remarks
VX For 032648-3427 12-
V347 Pup 061034-4844 12.5-14.5
AH Men 061144-8149 12.5-14
CP Pup 081146-3521 12.5-15
TU Crt 110336-2138 12-15 O
NN Cen 131416-6053 12.5-
V779 Cen 112115-6037 13-14.5
V830 Cen 114728-6157 13-14.5
V822 Cen 145822-3140 12.5-
V723 Sco 175005-3524 11-
V394 CrA 180026-3901 11-
V3941 Sgr 182559-2926 11- O
V345 Pav 193543-5908 13-14
PKS 2005-489 200925-4850 12-14
PKS 2155-304 215852-3013 12-14 O discrepant 12.6 star...
RZ Gru 224712-4245 11-13
Symb/other list
V366 Car 095443-5719 11-14
RT Cru 123454-6434 11-14
NSV 6160 131602-3700 11.5-13.5
V840 Cen 132047-5551 11.5-14.5
V852 Cen 141152-5126 11.5-14.5 Southern Crab
V835 Cen 141409-6326 11.5-14
V417 Cen 141556-6154 11.5-13.5
AR Cir 144809-6000 11.5-14.5
QS Nor 162108-4224 12-14
KX TrA 164435-6237 11-14
H1-36 174948-3701 11-13.5 nearby 3.2 star might interfere
AE Ara 174105-4703 11-14
V731 Sco 173321-3234 12-14.5
WX CrA 180850-3720 11-14.5
Y CrA 181423-4251 11.5-14
V2506 Sgr 181102-2833 11.5-14.5 O
V3804 Sgr 182129-3132 11.5-13.5
additional targets reachable from the Northern hemisphere, for sleepless nights...
Wray 15-1470 162321-2740 12-15 O
AS 210 165120-2600 12-14 O
AS 245 175101-2220 11-15 O
AS 270 180535-2021 11-15 O
H2-38 180601-2817 12-15 O
SS129 180706-2936 11-15 O
AS 294 181546-2754 11-15 O V2323 Sgr field
Hen 3-1591 180732-2554 11-15 O
If you ever run out of measuring targets, I've got some more...
Really, it would be great if some of the above targets of interest could be properly monitored, ie against meaningful sequences.
Recent field measurements by the Ouda group have shown to be very useful.
Thanks so much!
Good luck, especially to you, Stan. I hope you can cope....
Regards,
Berto Monard,
Pretoria
!
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!
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