7 November 2012: Further to AAVSO Alert Notice 473 (www.aavso.org/aavso alert-notice/473), Principal Investigator Darryl Sergison (University of Exeter) requests that spectroscopists planning to observe the targets RY Tau, DN Tau, and/or DR Tau image the corresponding telluric standards below at the same time:
Telluric standard for RY Tau
HD 283567 B9 Vmag = 10.38 RA 04 20 33.072 Dec +28 39 08.55
Telluric standard for DN Tau
HD 284571 A0 Vmag = 9.71 RA 04 37 46.253 Dec +24 02 45.93
Telluric standard for DR Tau
HD 286036 A0 Vmag = 10.54 RA 04 46 26.684 Dec +15 59 45.47
Imaging these objects at the same time as the targets will enable the removal of the effects of system response and atmospheric absorption.
Coordinates (2000)
RY Tau RA 04 21 57.41 Dec +28 26 35.6
DN Tau RA 04 35 27.38 Dec +24 14 58.9
DR Tau RA 04 47 06.22 Dec +16 58 42.8
Many thanks and good observing!
This AAVSO Special Notice was compiled by Elizabeth O. Waagen.
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