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Hello, Finally, got enough time to process my VV Cep obsertvations about the egress phase, continuing with flux (same way as in 2018 during eclipse). Followed only the CaII region (3850-4005A) for the egress at R~5000 (except 20191229.751 that is showing deep reverse P-Cyg, such as before ingress), ...

Hello, Catched a few days late after the outburst (~ 11.3 mag now), fresh result of this windy morning (12" Newton, ATIK 428Exm, LHires III + 600/mm grating + 35 micron slit): TCP_J21040470_4631129.png I belive H-alpha is changing in the meantime above noise. By RV range, it looks similar to Pa...

I can see some southern amateurs appreciating cooling. But, please take into account that - in a northern coutry, cooling is 100% needless (except summer). You can spend the money elsewhere in this luxury hobby. - if you want cooling, the regulation itself is a pure waste of money (for 1-2 secs of e...

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 f...

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

Fresh result from yesterday, scanned near-UV and NIR ranges, allowing comparative exploration: 1. 3870-4010A (CaII region): R~5300A, LHires III 2400/mm, 35 micron slit 1 x 20 min (more than enough signal), bin2x2, luckily had an earlier own spectrum in 2017: alfori_3870A_4010A_2017_vs_20191230.png T...

Nice coverage with the HST, Terry and Woody! I can shoot it only in the morning skies - managed at least bracketing the critical time (2 days before - vs - today): v694Mon_vhel_HaHbHeI4922_velo.png The He I 4922 change is visible also visually on raw spectra, it's the most obvious above noise level....

Fresh spectra from this morning, having switched to 2400/mm grating: - 4 x 20 min. H-alpha (R ~ 15000, 6500 - 6610A) - 5 x 10 min. H-beta (R ~ 9000, 4817 - 4961A), includes Fe I emissions + He I 4922 absorption Velocity plot (the H-alpha is comparative to half year before): v694Mon_velocities.png Ch...

2019.10.20 morning, with LHires III + 600/mm + 35 micron slit + ATIK 428 + 300/1200 Newton (+ APM 2.67x barlow), variable sky: - H-alpha @ R~2500 - He/Ne (~5800A) region @ R~2000= - H-beta @ R~1800 Not much change within a month at this resolution, except H-alpha changed somewhat: cmp_Ha_Hb.png Velo...

Fresh results from this morning: After shooting H-beta (2 x 600 sec), quickly switched to the H-alpha region (1 x 600 sec, sun background could be substracted easily): It looks to be continuing in similar state as this year spring.