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
v473 Lyr
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Robin Leadbeater
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Re: v473 Lyr
Congratulations Peter! Impressive precision on the RV values using a LHIRES
Cheers
Robin
Cheers
Robin
LHIRES III #29 ATIK314 ALPY 600/200 ATIK428 Star Analyser 100/200 C11 EQ6
http://www.threehillsobservatory.co.uk
http://www.threehillsobservatory.co.uk
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Francois Teyssier
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- Contact:
Re: v473 Lyr
Good work, Peter!
The uncertainty computed on the radial velocity (0.5 km/s) is very good
All the best,
François
The uncertainty computed on the radial velocity (0.5 km/s) is very good
All the best,
François
François Teyssier
http://www.astronomie-amateur.fr
http://www.astronomie-amateur.fr
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Peter Somogyi
- Posts: 420
- Joined: Sun Jul 13, 2014 8:56 am
Re: v473 Lyr
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
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