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v473 Lyr
Posted: Thu Jan 09, 2020 8:23 am
by Peter Somogyi
The result of
http://www.spectro-aras.com/forum/viewt ... =12&t=2261 has been included in this new paper:
"X-ray Observations of the Peculiar Cepheid V473 Lyr Identify A Low-Mass Companion"
https://arxiv.org/pdf/2001.02253
Peter
Re: v473 Lyr
Posted: Thu Jan 09, 2020 11:17 am
by Robin Leadbeater
Congratulations Peter! Impressive precision on the RV values using a LHIRES
Cheers
Robin
Re: v473 Lyr
Posted: Sat Jan 18, 2020 10:40 am
by Francois Teyssier
Good work, Peter!
The uncertainty computed on the radial velocity (0.5 km/s) is very good
All the best,
François
Re: v473 Lyr
Posted: Sun Jan 19, 2020 12:40 pm
by Peter Somogyi
Robin, Francois,
The 0.5 (- 0.8 a few) km/s error is coming from IRAF/fxcor task (should be the FHWM of gauss fit).
(+ another 0.5 km/sec for measuring reference star, so the total should be 1 km/sec)
This is only the easily measurable part of the error.
Slit guiding, flexture and calibration line fitting error was not included in this error assessment.
I had in mind returning to the reference star and get the shift again, but that was too much time taken off from observing time with the sunrise making it hard to find again, so finally skipped.
By the way, aavso is having this start on its list for spectro, though the conditions should be clarified first (cadence scheduling, period catching) before chosing to observe.
Cheers,
Peter