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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
[size=13.3333px]AAVSO Special Notice #419
[size=13.3333px]August 9, 2016

[size=13.3333px]V1687 Cyg spectroscopy and sequence and Subscription reminder


[size=13.3333px]V1687 Cyg spectroscopy and sequence

[size=13.3333px]Further to AAVSO Alert Notice 546
[size=13.3333px]([size=13.3333px]https://www.aavso.org/aavso-alert-notice-546[size=13.3333px]), spectroscopy of
[size=13.3333px]V1687 Cyg (WR 140, HD 193793) is encouraged. A group of amateur
[size=13.3333px]spectroscopists in Germany will be taking spectra in accordance
[size=13.3333px]with the parameters given by the astronomers, namely a resolving
[size=13.3333px]power >~5000, S/N~100, ideally concentrating on the wavelength
[size=13.3333px]region 5500-6000A. A background document sent to these
[size=13.3333px]spectroscopists may be found at
[size=13.3333px]([size=13.3333px]https://www.aavso.org/sites/default/files/WR140project2016.pdf[size=13.3333px]).
[size=13.3333px]Dr. Richardson and colleagues would welcome your participation -
[size=13.3333px]if you are interested in contributing spectroscopy as outlined
[size=13.3333px]above and in the document, please contact Thomas Eversberg
[size=13.3333px]<thomas.everbserg at dlr.de>.

[size=13.3333px]Also, the sequence for V1687 Cyg is in place, but because the star
[size=13.3333px]is so bright, small-scale charts will not show any comparison
[size=13.3333px]stars. Choose an 'A', 'AB', or 'B' scale chart (900, 450, or 180
[size=13.3333px]arcmin field of view, respectively) for useful comparison stars.
[size=13.3333px]A 'C' scale chart (120 arcmin) will show sufficient (although
[size=13.3333px]faint) stars for CCD/PEP/DSLR work.

[size=13.3333px]Coordinates (2000.0):  R.A. 20 20 27.98   Dec. +43 51 16.3

[size=13.3333px]Charts: Charts with a comparison star sequence for V1687 Cyg
[size=13.3333px]may be created using the AAVSO Variable Star Plotter (VSP) at
[size=13.3333px]https://www.aavso.org/vsp[size=13.3333px].


[size=13.3333px]Subscription Reminder about receiving Special Notices

[size=13.3333px]You are reminded that beginning August 10, AAVSO Special Notices
[size=13.3333px](and Alert Notices) will be sent ONLY to those who have subscribed
[size=13.3333px]via their AAVSO web account. An email was sent to all Special
[size=13.3333px]Notice subscribers on the current distribution list about this and
[size=13.3333px]giving instructions on how to subscribe using your (free) AAVSO
[size=13.3333px]account. This email may be found at
[size=13.3333px]([size=13.3333px]https://www.aavso.org/special-notice-subscription-message-aavso[size=13.3333px]).

[size=13.3333px]A similar message was sent to AAVSO Alert Notice subscribers. If
[size=13.3333px]you want to receive the Alert Notices (highly recommended), be sure
[size=13.3333px]to subscribe via your AAVSO account before August 10. The relevant
[size=13.3333px]email may be found at
[size=13.3333px]([size=13.3333px]https://www.aavso.org/alert-notice-subscription-message-aavso[size=13.3333px]).

[size=13.3333px]It is recommended that you subscribe to both the Alert Notices and
[size=13.3333px]the Special Notices.


[size=13.3333px]This Special Notice was compiled by Elizabeth O. Waagen.

[size=13.3333px]----------------------------------
[size=13.3333px]SUBMIT OBSERVATIONS TO THE AAVSO

[size=13.3333px]Information on submitting observations to the AAVSO may be found at:
[size=13.3333px]https://www.aavso.org/webobs

[size=13.3333px]SPECIAL NOTICE ARCHIVE AND SUBSCRIPTION INFORMATION

[size=13.3333px]A Special Notice archive is available at the following URL:
[size=13.3333px]https://www.aavso.org/special-notice-archive

[size=13.3333px]Subscribing and Unsubscribing may be done at the following URL:
[size=13.3333px]https://www.aavso.org/observation-notification#specialnotices

[size=13.3333px]-------------------------------------------------

[size=13.3333px]Please support the AAVSO and its mission -- Join or donate today:
[size=13.3333px]https://www.aavso.org/apps/donate/

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