Abstract
Abstract We report high-cadence photometry of the ultra-fast (t 2 ∼ 1.2 days) nova V1674 Her during its rise to maximum light (V ∼ 6.3) and the beginning of its subsequent decline. These observations from Evryscope and the Mount Laguna Observatory All-Sky Camera reveal a plateau in the pre-maximum light curve at g ∼ 14 (∼8 mag below peak) that lasted for at least three hours. Similar features (so-called pre-maximum halts) have been observed in some novae near maximum light, but to our knowledge the detection of a plateau in the light curve ∼8 mag below peak is unprecedented.
Highlights
V1674 Her (Nova Her 2021) was discovered by Seiji Ueda (Kushiro, Hokkaido, Japan) on 2021 June 12.5484 UT near magnitude 8.4
We report high-cadence photometry of the ultra-fast (t2 ∼ 1.2 d) nova V1674 Her during its rise to maximum light (V ∼ 6.3) and the beginning of its subsequent decline
Recent spectroscopic observations by Wagner et al (2021) have revealed strong [Ne V] 342.6 nm and the [Ne III] pair at 386.9, 396.8 nm, which establish the object as a member of the class of “Neon Novae” (Gehrz et al 1998). In this Research Note we report photometric observations of V1674 Her obtained with unprecedented coverage and temporal resolution using the Evryscope and the All-Sky Camera (ASC) at the Mount Laguna Observatory (MLO)
Summary
V1674 Her (Nova Her 2021) was discovered by Seiji Ueda (Kushiro, Hokkaido, Japan) on 2021 June 12.5484 UT near magnitude 8.4. Recent spectroscopic observations by Wagner et al (2021) have revealed strong [Ne V] 342.6 nm and the [Ne III] pair at 386.9, 396.8 nm, which establish the object as a member of the class of “Neon Novae” (Gehrz et al 1998). In this Research Note we report photometric observations of V1674 Her obtained with unprecedented coverage and temporal resolution using the Evryscope and the All-Sky Camera (ASC) at the Mount Laguna Observatory (MLO).
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