NICER observation list: Target ID 261001

Abstract

We request 40ksec to secure NICER observations of the Hyades (DAZ+K2V) 12.5-hr eclipsing binary V471 Tau. V471 Tau is an astrophysical lab for testing theories of binary star evolution, stellar physics as well as hosting a probable brown dwarf. We propose to capitalize on NICER s unique X-ray capabilities to secure rapid X-ray observations, crucial for characterizing the 9.25-min X-ray flux modulations seen previously that are theorized to arise from wind accretion on the WD s displaced magnetic poles relative to its rotation poles. The WD s rotation period also serves as an independent clock to search for the Light Travel Time Effect from the movement of the EB s barycenter by a brown dwarf. A 15.5-yr X-ray cycle will also be studied.
Obsid RA DEC l b Start End Exposure Number of
Modules
Number of
Processing
Status of
Processing
Date of
Processing
Public
date
2610010101 57.603 17.246 172.483 -27.938 58748.4233 58748.9706 9663.0 52 3 VALIDATED 58752.9 58762
2610010102 57.603 17.246 172.483 -27.938 58749.3909 58749.8736 9375.0 52 3 VALIDATED 58753.7 58763
2610010103 57.603 17.245 172.483 -27.939 58750.2296 58750.9701 16046.0 52 3 VALIDATED 58754.6 58764
2610010104 57.603 17.245 172.483 -27.939 58751.1969 58751.3539 2910.0 52 3 VALIDATED 58756.8 58765
2610010105 57.603 17.245 172.483 -27.939 58752.3588 58752.6463 9683.0 52 2 VALIDATED 58756.9 58766