Re: How and when to submit data to VSX.
- Thanks for Your time, Sebastian.
I'll try to submit this one in VSX, I had some thoughts whether VSX was the way to go or not, in this case. It's sometimes hard to express ones thoughts in plain text, especially in a non-native language :-)
My friends in the Swedish association have tried to help me finding a period for this one, but more data is needed.
--- In email@example.com, Sebastián Otero <sebastian@...> wrote:
> Hi, Tomas,
> > I'm an amateur astronomer from Sweden and a member of AAVSO (WTHB). I have
> > recently, due to the very poor Swedish autumn weather, done some variable
> > search in my pictures gathered with iTelescope. I have been using vphot
> > and VS search.
> > When examining my pictures I found a suspected variable star, close to
> > v393 Her, in position RA 17:22:40.06 DEC+26:55:23.64. After checking NSVS
> > and ASAS, I found out that this star seems to be variable, but has no
> > entry in VSX. It's known as NSVS 7991812 and ASAS 172239+26551.
> > Because I'm monitoring v393 Her, I would also like to have this star
> > entered in VSX to be able to load sequences in vphot and report the
> > magnitudes to AAVSO.
> > I have read the instructions in VSX, but I honestly don't know how to do
> > in this particular case. Should I try submitting and hope that the VSX
> > crew can guide me if it looks awkward?
> Please, be more specific regarding what you don't understand in the VSX
> From what you say it seems that the variability is apparent in NSVS and
> ASAS-3 data so the natural approach would be combining your observations
> with those from those surveys. This will surely allow to classify and find
> the elements for the variable star in question.
> Are you working with filters or unfiltered?
> The difference between filtered and unfiltered data depends on the star's
> color. If it is not a red variable shifting all magnitudes to the V scale
> (of your observations or ASAS-3) would work.
> So, combine the datasets, make a period search, classify the star based on
> the light curve shape, determine an Epoch (a time of primary minimum for
> eclipsing binaries, dark-spotted or RV Tauri stars and a time of maximum for
> pulsating variables and hot-spotted stars), make a phase plot (with
> different symbols for each dataset and showing 1.5 or 2 variability cycles
> for clarity and with your Epoch as phase 0) and submit the star to VSX.
> Fill in the form with as much information as possible.
> Give a catalogue name to your star (HD, BD, SAO, GSC, 2MASS, in that order)
> as well as other names from astrometric catalogues or surveys (UCAC4, NSVS,
> Use UCAC4 for the position.
> Use the variability types dropdown menu to choose the relevant type.
> Give the range and the passband. Choose V since you have ASAS-3 data (what
> magnitude are we talking about?)
> For the range, if the star is strictly periodic, give mean values for the
> maximum and minimum magnitudes, not extreme values. Take scatter into
> Add the elements you determined.
> Add the rise duration value if it is a cepheid, RR Lyrae or HADS (the time
> between a time of minimum and a time of maximum expressed as a percentage of
> the period)
> Add the eclipse duration (the same field) if the star is an EA-type
> eclipser. It is the time since the primary minimum's first contact (start of
> the descending branch) to the last one (end of the ascending branch)
> expressed as a percentage of the period. E.g. if the eclipse starts at phase
> 0.95 and ends at phase 0.05 the eclipse duration will be 10.
> In the additional remarks field you can add other information that couldn't
> be entered into the other fields. E.g.: magnitude of min II, the phase when
> min II happens if it is an eccentric binary, the presence of the O'Connell
> effect if maxima are different, other periods in case of multiperiodic
> stars, etc.
> Any doubt you can ask here, or as you have mentioned yourself, you can
> submit your star and then we'll guide you through the changes you need to
> But I think we have all more or less covered now.
> Do you have a possible classification for your star?
> Best wishes,
> Sebastian Otero
> VSX Team
> American Association of Variable Star Observers