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V1687 Cyg spectroscopy and sequence

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發表於 2016-8-10 06:07:22 | 顯示全部樓層 |閱讀模式
AAVSO Special Notice #419
August 9, 2016

V1687 Cyg spectroscopy and sequence and Subscription reminder


V1687 Cyg spectroscopy and sequence

Further to AAVSO Alert Notice 546
(https://www.aavso.org/aavso-alert-notice-546), spectroscopy of
V1687 Cyg (WR 140, HD 193793) is encouraged. A group of amateur
spectroscopists in Germany will be taking spectra in accordance
with the parameters given by the astronomers, namely a resolving
power >~5000, S/N~100, ideally concentrating on the wavelength
region 5500-6000A. A background document sent to these
spectroscopists may be found at
(https://www.aavso.org/sites/default/files/WR140project2016.pdf).
Dr. Richardson and colleagues would welcome your participation -
if you are interested in contributing spectroscopy as outlined
above and in the document, please contact Thomas Eversberg
<thomas.everbserg at dlr.de>.

Also, the sequence for V1687 Cyg is in place, but because the star
is so bright, small-scale charts will not show any comparison
stars. Choose an 'A', 'AB', or 'B' scale chart (900, 450, or 180
arcmin field of view, respectively) for useful comparison stars.
A 'C' scale chart (120 arcmin) will show sufficient (although
faint) stars for CCD/PEP/DSLR work.

Coordinates (2000.0):  R.A. 20 20 27.98   Dec. +43 51 16.3

Charts: Charts with a comparison star sequence for V1687 Cyg
may be created using the AAVSO Variable Star Plotter (VSP) at
https://www.aavso.org/vsp.


Subscription Reminder about receiving Special Notices

You are reminded that beginning August 10, AAVSO Special Notices
(and Alert Notices) will be sent ONLY to those who have subscribed
via their AAVSO web account. An email was sent to all Special
Notice subscribers on the current distribution list about this and
giving instructions on how to subscribe using your (free) AAVSO
account. This email may be found at
(https://www.aavso.org/special-notice-subscription-message-aavso).

A similar message was sent to AAVSO Alert Notice subscribers. If
you want to receive the Alert Notices (highly recommended), be sure
to subscribe via your AAVSO account before August 10. The relevant
email may be found at
(https://www.aavso.org/alert-notice-subscription-message-aavso).

It is recommended that you subscribe to both the Alert Notices and
the Special Notices.


This Special Notice was compiled by Elizabeth O. Waagen.

----------------------------------
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