Alert Notice 754: Monitoring requested for 15 VY Scl cataclysmic variables in support of HST observations

Active Dates: Sept. 14, 2021 – Dec. 31, 2024


Abstract:

AAVSO observers are requested to monitor 15 VY Scl novalike cataclysmic variables to support Hubble Space Telescope observations.

Justification:

HST observations need to be obtained during a low state when the white dwarf is the dominant source of light in the ultraviolet. Continuous nightly monitoring over the entire visible period is useful to detect the occurrence of a low state.

Requested Data Types:

Spectroscopy, Photometry



Targets
Name Magnitude Variability Type Photometry Notes Spectroscopy Notes
VY Scl 11.80 NL/VY

Cadence: Custom

Precision: 100

Cadence: Custom

Resolution: 250

Desired SNR: 100

BMAM-V380 18.90 UG

Cadence: Custom

Precision: 100

Cadence: Custom

Resolution: 250

Desired SNR: 100

HS 0220+0603 15.70 NL/VY+E

Cadence: Custom

Precision: 100

Cadence: Custom

Resolution: 250

Desired SNR: 100

LN UMa 14.60 UGZ/IW+VY

Cadence: Custom

Precision: 100

Cadence: Custom

Resolution: 250

Desired SNR: 100

1SWASP J022916.91-395901.4 12.80 UGZ/IW+VY

Cadence: Custom

Precision: 100

Cadence: Custom

Resolution: 250

Desired SNR: 100

HS 0506+7725 14.60 NL/VY

Cadence: Custom

Precision: 100

Cadence: Custom

Resolution: 250

Desired SNR: 100

KR Aur 12.70 NL/VY

Cadence: Custom

Precision: 100

Cadence: Custom

Resolution: 250

Desired SNR: 100

BMAM-V442 17.98 EA/HW

Cadence: Custom

Precision: 100

Cadence: Custom

Resolution: 250

Desired SNR: 100

GS Pav 14.80 UGSS+E

Cadence: Custom

Precision: 100

Cadence: Custom

Resolution: 250

Desired SNR: 100

BMAM-V794 18.00 UG

Cadence: Custom

Precision: 100

Cadence: Custom

Resolution: 250

Desired SNR: 100

1RXS J233801.0+430852 16.05 NL/VY

Cadence: Custom

Precision: 100

Cadence: Custom

Resolution: 250

Desired SNR: 100

BMAM-V704 17.20 CV

Cadence: Custom

Precision: 100

Cadence: Custom

Resolution: 250

Desired SNR: 100

WX Ari 14.50 NL/VY+E

Cadence: Custom

Precision: 100

Cadence: Custom

Resolution: 250

Desired SNR: 100

V1024 Cep 14.70 NL/VY+E

Cadence: Custom

Precision: 100

Cadence: Custom

Resolution: 250

Desired SNR: 100

BMAM-V425 18.60 RCB:

Cadence: Custom

Precision: 100

Cadence: Custom

Resolution: 250

Desired SNR: 100


Spectroscopy Lines:

H-beta (4861.0 Å), H-alpha (6563.0 Å)

Photometry Filters:

V (Johnson)

Comparison Stars:

Finder charts with comparison stars may be created using the AAVSO Variable Star Plotter (VSP, https://apps.aavso.org/vsp/).


Co-Authorship

Observers are not eligible for co-authorship.

Additional Observer Input:

Cadence, filters, lines needed will depend on whether any of these targets are detected going into their low (faint) state. Monitoring a few times/week while in their bright state is requested, and multiple observations per filter per night in low state. Complete observing instructions may be found here: https://www.aavso.org/aavso-alert-notice-841-backup-copy

Additional Submission Location:

Not provided



Notes:

Principal Investigator: Drs. Anna Francesca Pala and Thomas Kupfer; Imported Campaign (Alert Notice #754)