|Proposer||(15617) Barber Observatory University of Illinois Springfield (firstname.lastname@example.org) obscode: UIS01|
|Assigned To||(3663) Dirk Terrell|
|Date Submitted||Aug. 4, 2017|
Stars classified "Be" are stars with B spectral types AND conspicuous hydrogen and helium emission lines. Many of these stars are main sequence stars that exhibit low level irregular variability (~0.1 mag) and changes in the profiles of their emission lines. Many Be stars a known to unpredictably turn off and then later re-estabilsh their emission. There is some evidence that the phenomenon is associated with binary but it cannot be conclusively stated that all Be stars are binary. The best hypothesis is that the emission lines are produced in circumstellar gas, probably in the form of an excretion disk formed from the radiatively driven stellar wind. Although there have been may theoretical attempts to comprehensively model the Be phenomenon there is no comprehensive theoretical model for the disks or how they form and dissipate.
Be stars have been a popular target among non-professionals doing spectroscopy. See the Be Star Spectra Database (BeSS; http://basebe.obspm.fr/basebe/)
The time scale of changes in Be stars is usually measured in months or years. We propose monthly or bimonthly Johnson B and V photometry from BSM images over an indefinite period going forward. I propose to do this as a public service to the bright Be Star community, making the data immediately available in WebObs (with NO proprietary period) as soon as it is reduced.
|Target||RA (H.HH)||Dec (D.DD)||Magnitude||Telescope||Observation Frequency||Expiration Date||Proprietary Term|
The TAC suggests a weekly cadence and UBVRI filters.
Thanks. I'll take weekly in all filters.
I have a concern though that I may not be able to measure the photometry for U in VPHOT and that there may not be comparison stars/ sequences for U developed for these targets.
The other filters have no such concerns.
Zeta Tau=123 Tau=000-BBJ-767
Kap Dra=5 Dra=000-BCV-882
Beta Psc=4 Psc=000-BCR-153
Please change the centering of the images for Pi Aqr to 22h24m26s +01d02m21s so that it includes both the target and HD 212318 which is 53.4 arcmin to the SW
I am now getting two sets of images for Pi Aqr each night. One centered on Pi Aqr (22.4212777778, +1.3775) and the other centered as directed on the comment on June 21 (22h24m26s +01d02m21s). Please discontinue the first one (centered on the star) and continue to image centered on the coordinates 22h24m26s +01d02m21s.
I need the center for images for Psi Per updated please.
The last two sets of images the comparison (which is normally on the edge of the field with Psi Per centered) was off the edge. Could be rotation of the field or bad pointing the caused it. It happened twice in a row so I want to suggest it will work better to center the field at RA 03:34:30 Dec +48:13:30 putting the image center roughly halfway between the target and the comparison.
Comments on this proposal are closed.